chore: remove redundant frontmatter

2024-02-17 13:27:49 +00:00 · 2024-02-17 13:27:49 +00:00 · 579fe8ad20
commit 579fe8ad20
parent fbad4fc2a0
392 changed files with 13 additions and 911 deletions
--- a/scripts/remove_frontmatter.py
+++ b/scripts/remove_frontmatter.py
@ -3,7 +3,7 @@ import os
 import re

 # Define the directory
-directory = "/home/thomas/repos/eolas-bak/zk"
+directory = "/home/thomas/repos/eolas/zk"

 # Define the regex patterns
 title_pattern = re.compile(r"title:.*\n")
--- a/zk/0_Introduction.md
+++ b/zk/0_Introduction.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [backend, node-js, REST, APIs]
 ---

--- a/zk/1_GET.md
+++ b/zk/1_GET.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [backend, node-js, REST, APIs]
 ---

--- a/zk/2_POST.md
+++ b/zk/2_POST.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [backend, node-js, REST, APIs]
 ---

--- a/zk/3_PUT.md
+++ b/zk/3_PUT.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [backend, node-js, REST, APIs]
 ---

--- a/zk/5__Integrating_the_database.md
+++ b/zk/5__Integrating_the_database.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Programming Languages
-  - Databases
 tags: [backend, node-js, REST, APIs, mongo-db]
 ---

--- a/zk/API_Gateway.md
+++ b/zk/API_Gateway.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - DevOps
-  - Backend
 tags: [AWS, APIs]
 ---

--- a/zk/AWS_SAM_and_Docker.md
+++ b/zk/AWS_SAM_and_Docker.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [docker, gpt-output]
 ---

--- a/zk/Accessing_metadata_about_SQL_database.md
+++ b/zk/Accessing_metadata_about_SQL_database.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL]
 ---

--- a/zk/Accessing_secrets_from_a_Lambda.md
+++ b/zk/Accessing_secrets_from_a_Lambda.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - DevOps
-  - Backend
 tags: [AWS, aws-lambda]
 ---

--- a/zk/Add_Subtract_Fractions.md
+++ b/zk/Add_Subtract_Fractions.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - fractions
--- a/zk/Adding_documents_to_a_collection.md
+++ b/zk/Adding_documents_to_a_collection.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [mongo-db, node-js, mongoose]
 ---

--- a/zk/Additive_identity.md
+++ b/zk/Additive_identity.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - theorems
 ---
--- a/zk/Additive_inverse_property.md
+++ b/zk/Additive_inverse_property.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - theorems
 ---
--- a/zk/Aggregate_functions_in_SQL.md
+++ b/zk/Aggregate_functions_in_SQL.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL]
 ---

--- a/zk/Algebra_key_terms.md
+++ b/zk/Algebra_key_terms.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags: [algebra]
 ---

--- a/zk/Analogue_and_digital.md
+++ b/zk/Analogue_and_digital.md
@ -1,7 +1,4 @@
 ---
-title: Analogue and digital
-categories:
-  - Hardware
 tags: [analogue]
 ---

--- a/zk/Any.md
+++ b/zk/Any.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
 ---
--- a/zk/Apollo_Client.md
+++ b/zk/Apollo_Client.md
@ -1,7 +1,4 @@
 ---
-title: Apollo Client
-categories:
-  - Databases
 tags: [graphql]
 ---

--- a/zk/Apollo_Server.md
+++ b/zk/Apollo_Server.md
@ -1,7 +1,4 @@
 ---
-title: Apollo Server
-categories:
-  - Databases
 tags: [graphql, REST, APIs]
 ---

@ -37,8 +34,7 @@ type Query {

 type Track {
  id: ID!
-  title: String!
-  author: Author!
+    author: Author!
  thumbnail: String
  length: Int
  modulesCount: Int
@ -102,8 +98,7 @@ const server = new ApolloServer({ typeDefs, mocks: true });
 const mocks = {
  Track: () => ({
    id: () => "track_01",
-    title: () => "Astro Kitty, Space Explorer",
-    author: () => {
+        author: () => {
      return {
        name: "Grumpy Cat",
        photo:
--- a/zk/Application_state_management.md
+++ b/zk/Application_state_management.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/Application_structure.md
+++ b/zk/Application_structure.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/Arithmetic_Logic_Unit.md
+++ b/zk/Arithmetic_Logic_Unit.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Computer Architecture
 tags: [CPU]
 ---

--- a/zk/Arrays.md
+++ b/zk/Arrays.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DSA
 tags:
  - data-structures
 ---
--- a/zk/Associativity.md
+++ b/zk/Associativity.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - theorems
  - prealgebra
--- a/zk/Atomic_and_molecular_propositions.md
+++ b/zk/Atomic_and_molecular_propositions.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Autoincrement_for_unique_key_in_SQL.md
+++ b/zk/Autoincrement_for_unique_key_in_SQL.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL, relational-databases]
 ---

--- a/zk/Awk.md
+++ b/zk/Awk.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
  - awk
--- a/zk/Axioms_of_set_theory.md
+++ b/zk/Axioms_of_set_theory.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - set-theory
  - theorems
--- a/zk/Basic_Model.md
+++ b/zk/Basic_Model.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Operating Systems
-  - Linux
 tags:
 ---

--- a/zk/Basic_prop_passing.md
+++ b/zk/Basic_prop_passing.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/Basic_properties_of_sets.md
+++ b/zk/Basic_properties_of_sets.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Mathematics
-  - Logic
 tags:
  - set-theory
 ---
--- a/zk/Basics_of_web_components.md
+++ b/zk/Basics_of_web_components.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - frontend
 ---
--- a/zk/Best_practices.md
+++ b/zk/Best_practices.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Biconditional_Elimination.md
+++ b/zk/Biconditional_Elimination.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: []
 ---

--- a/zk/Biconditional_Introduction.md
+++ b/zk/Biconditional_Introduction.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: []
 ---

--- a/zk/Binary_addition.md
+++ b/zk/Binary_addition.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Mathematics
-  - Computer Architecture
 tags: [binary, binary-arithmetic]
 ---

--- a/zk/Binary_arithmetic.md
+++ b/zk/Binary_arithmetic.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Mathematics
-  - Computer Architecture
 tags: [binary, binary-arithemetic]
 ---

--- a/zk/Binary_colour_encoding.md
+++ b/zk/Binary_colour_encoding.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Computer Architecture
 tags: [binary, binary-encoding]
 ---

--- a/zk/Binary_encoding.md
+++ b/zk/Binary_encoding.md
@ -1,7 +1,4 @@
 ---
-title: Binary encoding
-categories:
-  - Computer Architecture
 tags: [binary, binary-encoding]
 ---

--- a/zk/Binary_encoding_of_text.md
+++ b/zk/Binary_encoding_of_text.md
@ -1,7 +1,4 @@
 ---
-title: Text encoding
-categories:
-  - Computer Architecture
 tags: [binary, binary-encoding]
 ---

--- a/zk/Binary_number_system.md
+++ b/zk/Binary_number_system.md
@ -1,8 +1,4 @@
 ---
-title: Binary number system
-categories:
-  - Mathematics
-  - Computer Architecture
 tags: [binary, number-systems]
 ---

--- a/zk/Binary_units_of_measurement.md
+++ b/zk/Binary_units_of_measurement.md
@ -1,8 +1,4 @@
 ---
-title: Binary units of measurement
-categories:
-  - Computer Architecture
-  - Mathematics
 tags: [binary]
 ---

--- a/zk/Bluetooth.md
+++ b/zk/Bluetooth.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Linux
-  - Networks
 tags: []
 ---

--- a/zk/Boolean_algebra.md
+++ b/zk/Boolean_algebra.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Logic
-  - Computer Architecture
 tags: [propositional-logic, algebra, nand-to-tetris]
 ---

--- a/zk/Boolean_function_synthesis.md
+++ b/zk/Boolean_function_synthesis.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Logic
-  - Computer Architecture
 tags: [propositional-logic, nand-to-tetris]
 ---

--- a/zk/Boolean_functions.md
+++ b/zk/Boolean_functions.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Logic
-  - Computer Architecture
 tags: [propositional-logic, nand-to-tetris]
 ---

--- a/zk/Boot_process.md
+++ b/zk/Boot_process.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Linux
-  - Operating Systems
 tags:
  - disks
 ---
--- a/zk/Built_in_hooks.md
+++ b/zk/Built_in_hooks.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
  - react
--- a/zk/Bus.md
+++ b/zk/Bus.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Computer Architecture
-  - Hardware
 tags: [bus]
 ---

--- a/zk/CPU_architecture.md
+++ b/zk/CPU_architecture.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Computer Architecture
 tags: [CPU, electromagnetism, clock]
 ---

--- a/zk/Call_stack.md
+++ b/zk/Call_stack.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Software Engineering
 tags: []
 ---

--- a/zk/Capturing_user_input_in_Bash.md
+++ b/zk/Capturing_user_input_in_Bash.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Case_statements_in_Bash.md
+++ b/zk/Case_statements_in_Bash.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Cells_and_batteries.md
+++ b/zk/Cells_and_batteries.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Electronics
 tags: [physics, electricity]
 ---

--- a/zk/Cherry_picking.md
+++ b/zk/Cherry_picking.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags:
  - git
 ---
--- a/zk/Child_to_parent_data_flow.md
+++ b/zk/Child_to_parent_data_flow.md
@ -1,7 +1,4 @@
 ---
-title: Child to parent data-flow
-categories:
-  - Programming Languages
 tags: [javascript, react, react-hooks]
 ---

--- a/zk/Chipset_and_controllers.md
+++ b/zk/Chipset_and_controllers.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Computer Architecture
-  - Hardware
 tags: [motherboard]
 ---

--- a/zk/Circuits.md
+++ b/zk/Circuits.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Electronics
 tags: [electricity, circuits]
 ---

--- a/zk/Class_inheritance_in_Python.md
+++ b/zk/Class_inheritance_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, OOP]
 ---

--- a/zk/Classes.md
+++ b/zk/Classes.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages

 tags: [typescript, OOP]
 ---
--- a/zk/Classes_in_Python.md
+++ b/zk/Classes_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, OOP]
 ---

--- a/zk/Clock_signals.md
+++ b/zk/Clock_signals.md
@ -1,8 +1,4 @@
 ---
-categories:
-  - Computer Architecture
-  - Electronics
-  - Hardware
 tags: [binary, memory, clock, electromagnetism]
 ---

--- a/zk/CloudWatch.md
+++ b/zk/CloudWatch.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - DevOps
-  - Backend
 tags: [AWS]
 ---

--- a/zk/Command_pattern.md
+++ b/zk/Command_pattern.md
@ -1,7 +1,4 @@
 ---
-title: Command pattern
-categories:
-  - DSA
 tags:
  - design-patterns
 ---
--- a/zk/Commutativity.md
+++ b/zk/Commutativity.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - theorems
 ---
--- a/zk/Comparing_classes_to_hooks.md
+++ b/zk/Comparing_classes_to_hooks.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/Compile_from_source.md
+++ b/zk/Compile_from_source.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Linux
 tags: []
 ---

--- a/zk/Complete_example.md
+++ b/zk/Complete_example.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [mongo-db, node-js, mongoose]
 ---

--- a/zk/Components.md
+++ b/zk/Components.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
  - react
--- a/zk/Components_props_classes.md
+++ b/zk/Components_props_classes.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/Components_props_hooks.md
+++ b/zk/Components_props_hooks.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/Conditional_Elimination.md
+++ b/zk/Conditional_Elimination.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: []
 ---

--- a/zk/Conditional_Introduction.md
+++ b/zk/Conditional_Introduction.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: []
 ---

--- a/zk/Conditional_statements_in_Python.md
+++ b/zk/Conditional_statements_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python]
 ---

--- a/zk/Conditionals.md
+++ b/zk/Conditionals.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Conjunction_Elimination.md
+++ b/zk/Conjunction_Elimination.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: []
 ---

--- a/zk/Conjunction_Introduction.md
+++ b/zk/Conjunction_Introduction.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: []
 ---

--- a/zk/Connect_to_database.md
+++ b/zk/Connect_to_database.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [mongo-db, node-js, mongoose]
 ---

--- a/zk/Connecting_a_frontend_to_a_Docker_backend.md
+++ b/zk/Connecting_a_frontend_to_a_Docker_backend.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - DevOps
-  - Databases
 tags: [docker, SQL, node-js]
 ---

--- a/zk/Containerization.md
+++ b/zk/Containerization.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [docker, containerization, Linux]
 ---

--- a/zk/Controlled_components.md
+++ b/zk/Controlled_components.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/Corresponding_material_and_biconditional.md
+++ b/zk/Corresponding_material_and_biconditional.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Coulombs_Laws.md
+++ b/zk/Coulombs_Laws.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Electronics
 tags: [physics, electricity]
 ---

--- a/zk/Create_an_SQL_table.md
+++ b/zk/Create_an_SQL_table.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL, relational-databases]
 ---

--- a/zk/Create_database.md
+++ b/zk/Create_database.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [mongo-db, node-js, mongoose]
 ---

--- a/zk/Create_timed_systemd_job.md
+++ b/zk/Create_timed_systemd_job.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Linux
 tags: [systems-programming]
 ---

--- a/zk/Creating_a_Docker_image.md
+++ b/zk/Creating_a_Docker_image.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [docker]
 ---

--- a/zk/Creating_a_schema_and_model.md
+++ b/zk/Creating_a_schema_and_model.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [mongo-db, node-js, mongoose]
 ---

--- a/zk/Creating_memory_with_NAND.md
+++ b/zk/Creating_memory_with_NAND.md
@ -1,9 +1,4 @@
 ---
-title: Creating memory with NAND gates
-categories:
-  - Computer Architecture
-  - Electronics
-  - Hardware
 tags: [logic-gates, binary, memory]
 ---

--- a/zk/Cron.md
+++ b/zk/Cron.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Programming Languages
-  - Linux
 tags:
  - shell
 ---
--- a/zk/Current.md
+++ b/zk/Current.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Electronics
 tags: [physics, electricity]
 ---

--- a/zk/Custom_hook_examples.md
+++ b/zk/Custom_hook_examples.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/Custom_types.md
+++ b/zk/Custom_types.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
 ---
--- a/zk/Daemons.md
+++ b/zk/Daemons.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Operating Systems
 tags:
 ---

--- a/zk/Data_types_in_Bash.md
+++ b/zk/Data_types_in_Bash.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
  - data-types
--- a/zk/Data_types_in_MySQL.md
+++ b/zk/Data_types_in_MySQL.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL, relational-databases]
 ---

--- a/zk/Database_indices.md
+++ b/zk/Database_indices.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [relational-databases]
 ---

--- a/zk/Database_options_on_AWS.md
+++ b/zk/Database_options_on_AWS.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [AWS]
 ---

--- a/zk/Dates_in_Python.md
+++ b/zk/Dates_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, timestamps]
 ---

--- a/zk/DeMorgan's_Laws.md
+++ b/zk/DeMorgan's_Laws.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: []
 ---

--- a/zk/Defining_a_computer.md
+++ b/zk/Defining_a_computer.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Computer Architecture
 tags:
  - theory-of-computation
 ---
--- a/zk/Delete_a_branch.md
+++ b/zk/Delete_a_branch.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [git]
 ---

--- a/zk/Delete_records_in_an_SQL_table.md
+++ b/zk/Delete_records_in_an_SQL_table.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL, relational-databases]
 ---

--- a/zk/Deleting_documents.md
+++ b/zk/Deleting_documents.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [mongo-db, node-js, mongoose]
 ---

--- a/zk/Dependency_injection.md
+++ b/zk/Dependency_injection.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Software Engineering
 tags: [OOP]
 ---

--- a/zk/Devices.md
+++ b/zk/Devices.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Linux
-  - Operating Systems
 tags:
 ---

--- a/zk/Dictionaries_in_Python.md
+++ b/zk/Dictionaries_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, data-structures]
 ---

--- a/zk/Difference_between_remote_origin_and_head.md
+++ b/zk/Difference_between_remote_origin_and_head.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [git]
 ---

--- a/zk/Digital_circuits.md
+++ b/zk/Digital_circuits.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Electronics
 tags: [circuits]
 ---

--- a/zk/Disjunction_Elimination.md
+++ b/zk/Disjunction_Elimination.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: []
 ---

--- a/zk/Disjunction_Introduction.md
+++ b/zk/Disjunction_Introduction.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: []
 ---

--- a/zk/Disk_info.md
+++ b/zk/Disk_info.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Linux
 tags: [systems-programming]
 ---

--- a/zk/Distributivity.md
+++ b/zk/Distributivity.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - theorems
  - prealgebra
--- a/zk/Dividing_fractions.md
+++ b/zk/Dividing_fractions.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - fractions
--- a/zk/Docker_Compose.md
+++ b/zk/Docker_Compose.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [docker]
 ---

--- a/zk/Docker_architecture.md
+++ b/zk/Docker_architecture.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [docker, containerization]
 ---

--- a/zk/Docker_containers.md
+++ b/zk/Docker_containers.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [docker, containerization]
 ---

--- a/zk/Docker_general_overview.md
+++ b/zk/Docker_general_overview.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [docker, containerization]
 ---

--- a/zk/Docker_images.md
+++ b/zk/Docker_images.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [docker]
 ---

--- a/zk/Effective_logging_in_Git.md
+++ b/zk/Effective_logging_in_Git.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [git, procedural]
 ---

--- a/zk/Electromagnetism.md
+++ b/zk/Electromagnetism.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Electronics
 tags: [physics, electricity, electromagnetism]
 ---

--- a/zk/Electrons.md
+++ b/zk/Electrons.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Electronics
 tags: [physics, electricity]
 ---

--- a/zk/Enums.md
+++ b/zk/Enums.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
 ---
--- a/zk/Environmental_and_shell_variables.md
+++ b/zk/Environmental_and_shell_variables.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Equivalent_equations.md
+++ b/zk/Equivalent_equations.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags: [algebra]
 ---

--- a/zk/Equivalent_fractions.md
+++ b/zk/Equivalent_fractions.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - fractions
--- a/zk/Error_handling_in_Python.md
+++ b/zk/Error_handling_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python]
 ---

--- a/zk/Errors.md
+++ b/zk/Errors.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/Event_loop.md
+++ b/zk/Event_loop.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/Events.md
+++ b/zk/Events.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
  - react
--- a/zk/Expansions_and_substitutions.md
+++ b/zk/Expansions_and_substitutions.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Exponents.md
+++ b/zk/Exponents.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags: [algebra, exponents]
 ---

--- a/zk/Expressing_whole_numbers_as_fractions.md
+++ b/zk/Expressing_whole_numbers_as_fractions.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - fractions
--- a/zk/Factors_and_divisors.md
+++ b/zk/Factors_and_divisors.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
 ---
--- a/zk/Factory_pattern.md
+++ b/zk/Factory_pattern.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DSA
 tags:
  - OOP
 ---
--- a/zk/Fetch_decode_execute.md
+++ b/zk/Fetch_decode_execute.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Computer Architecture
 tags: [CPU]
 ---

--- a/zk/Fetch_from_Secrets_Manager.md
+++ b/zk/Fetch_from_Secrets_Manager.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [AWS, backend]
 ---

--- a/zk/File_descriptors.md
+++ b/zk/File_descriptors.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/File_permissions_and_execution.md
+++ b/zk/File_permissions_and_execution.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Filesystems.md
+++ b/zk/Filesystems.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Linux
-  - Operating Systems
 tags:
  - disks
 ---
--- a/zk/Find.md
+++ b/zk/Find.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Flip_flops.md
+++ b/zk/Flip_flops.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Electronics
-  - Hardware
 tags: [logic-gates, binary, memory, clock]
 ---

--- a/zk/Foreign_keys_in_SQL.md
+++ b/zk/Foreign_keys_in_SQL.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL, relational-databases]
 ---

--- a/zk/Formal_conventions.md
+++ b/zk/Formal_conventions.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
 ---
--- a/zk/Formal_proofs_in_propositional_logic.md
+++ b/zk/Formal_proofs_in_propositional_logic.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Formatting_output_text_in_Bash.md
+++ b/zk/Formatting_output_text_in_Bash.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Forms.md
+++ b/zk/Forms.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/Four_bit_adder.md
+++ b/zk/Four_bit_adder.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Hardware
-  - Electronics
 tags: [logic-gates, binary]
 ---

--- a/zk/Frequency_counters.md
+++ b/zk/Frequency_counters.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DSA
 tags: []
 ---

--- a/zk/Frequent_commands.md
+++ b/zk/Frequent_commands.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - DevOps
-  - Backend
 tags: [AWS]
 ---

--- a/zk/Full_example.md
+++ b/zk/Full_example.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [backend, node-js, REST, APIs]
 ---

--- a/zk/Function_overloads.md
+++ b/zk/Function_overloads.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
 ---
--- a/zk/Functions.md
+++ b/zk/Functions.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
  - react
--- a/zk/Functions_called_on_click.md
+++ b/zk/Functions_called_on_click.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/Functions_in_Bash.md
+++ b/zk/Functions_in_Bash.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Functions_in_Python.md
+++ b/zk/Functions_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python]
 ---

--- a/zk/Fundamental_Theorem_of_Arithmetic.md
+++ b/zk/Fundamental_Theorem_of_Arithmetic.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - theorems
--- a/zk/Further_examples_of_generics.md
+++ b/zk/Further_examples_of_generics.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
 ---
--- a/zk/Generics.md
+++ b/zk/Generics.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
 ---
--- a/zk/Git_bisect.md
+++ b/zk/Git_bisect.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [git]
 ---

--- a/zk/Global_object.md
+++ b/zk/Global_object.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/Grep.md
+++ b/zk/Grep.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Ground.md
+++ b/zk/Ground.md
@ -1,7 +1,4 @@
 ---
-title: Ground
-categories:
-  - Electronics
 tags: [physics, electricity]
 ---

--- a/zk/Guide_to_YAML.md
+++ b/zk/Guide_to_YAML.md
@ -1,5 +1,4 @@
 ---
-categories: [Programming Languages]
 tags: []
 ---

--- a/zk/HTTP_request_types.md
+++ b/zk/HTTP_request_types.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Networks
 tags: []
 ---

--- a/zk/Half_adder_and_full_adder.md
+++ b/zk/Half_adder_and_full_adder.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Hardware
-  - Electronics
 tags: [logic-gates, binary]
 ---

--- a/zk/Handle_multiple_endpoints_single_lambda.md
+++ b/zk/Handle_multiple_endpoints_single_lambda.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [AWS, aws-lambda, backend]
 ---

--- a/zk/Handling_negative_fractions.md
+++ b/zk/Handling_negative_fractions.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - fractions
--- a/zk/Hardware_Description_Language.md
+++ b/zk/Hardware_Description_Language.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Computer Architecture
-  - Hardware
 tags: [nand-to-tetris]
 ---

--- a/zk/Hardware_abstraction_and_modularity.md
+++ b/zk/Hardware_abstraction_and_modularity.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Computer Architecture
-  - Hardware
 tags: [nand-to-tetris]
 ---

--- a/zk/Hardware_simulation.md
+++ b/zk/Hardware_simulation.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Computer Architecture
-  - Hardware
 tags: [nand-to-tetris]
 ---

--- a/zk/Hexadecimal_number_system.md
+++ b/zk/Hexadecimal_number_system.md
@ -1,8 +1,4 @@
 ---
-title: Hexadecimal number system
-categories:
-  - Computer Architecture
-  - Mathematics
 tags: [number-systems]
 ---

--- a/zk/IO_in_Python.md
+++ b/zk/IO_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python]
 ---

--- a/zk/Identify_merged_branches.md
+++ b/zk/Identify_merged_branches.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [git]
 ---

--- a/zk/Importing_data.md
+++ b/zk/Importing_data.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [mongo-db, node-js]
 ---

--- a/zk/Increasing_fractions_to_their_highest_terms.md
+++ b/zk/Increasing_fractions_to_their_highest_terms.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - fractions
--- a/zk/Insert_data_into_SQL_table.md
+++ b/zk/Insert_data_into_SQL_table.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL, relational-databases]
 ---

--- a/zk/Instruction_set_architectures.md
+++ b/zk/Instruction_set_architectures.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Computer Architecture
 tags: [CPU]
 ---

--- a/zk/Integers.md
+++ b/zk/Integers.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
 ---
--- a/zk/Integrated_circuits.md
+++ b/zk/Integrated_circuits.md
@ -1,8 +1,4 @@
 ---
-title: Integrated circuits
-categories:
-  - Electronics
-  - Hardware
 tags: [logic-gates]
 ---

--- a/zk/Interactive_staging.md
+++ b/zk/Interactive_staging.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [git]
 ---

--- a/zk/Intersection_types.md
+++ b/zk/Intersection_types.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
 ---
--- a/zk/Intro_to_the_Unix_shell.md
+++ b/zk/Intro_to_the_Unix_shell.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Introduction.md
+++ b/zk/Introduction.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [mongo-db]
 ---

--- a/zk/Inversion_of_operators.md
+++ b/zk/Inversion_of_operators.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
 ---
--- a/zk/Iterating.md
+++ b/zk/Iterating.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
@ -80,8 +78,7 @@ const blogData = [
  {
    id: 1,
    date: "2020-11-15",
-    title: "Nulla quis sem at nibh elementum imperdiet. Duis sagittis ipsum.",
-    shortByline:
+        shortByline:
      "Quisque cursus, metus vitae pharetra auctor, sem massa mattis sem, at interdum magna augue eget diam. ",
    longByline:
      "Quisque cursus, metus vitae pharetra auctor, sem massa mattis sem, at interdum magna augue eget diam. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Morbi lacinia molestie dui. Praesent blandit dolor.",
@ -90,8 +87,7 @@ const blogData = [
  {
    id: 2,
    date: "2020-08-11",
-    title: "Nulla quis sem at nibh elementum imperdiet. Duis sagittis ipsum.",
-    shortByline:
+        shortByline:
      "Quisque cursus, metus vitae pharetra auctor, sem massa mattis sem, at interdum magna augue eget diam. ",
    longByline:
      "Quisque cursus, metus vitae pharetra auctor, sem massa mattis sem, at interdum magna augue eget diam. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Morbi lacinia molestie dui. Praesent blandit dolor.",
--- a/zk/Iterating_through_complex_data_structures_in_Python.md
+++ b/zk/Iterating_through_complex_data_structures_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python]
 ---

--- a/zk/Joins_in_SQL.md
+++ b/zk/Joins_in_SQL.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL]
 ---

--- a/zk/Journey_of_GraphQL_query.md
+++ b/zk/Journey_of_GraphQL_query.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [graphql]
 ---

--- a/zk/Key_characteristics_of_GraphQL.md
+++ b/zk/Key_characteristics_of_GraphQL.md
@ -1,7 +1,4 @@
 ---
-title: Key characteristics of GraphQL
-categories:
-  - Databases
 tags: [graphql, APIs]
 ---

--- a/zk/Killing_processes.md
+++ b/zk/Killing_processes.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/LEDs.md
+++ b/zk/LEDs.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Electronics
 tags: [electricity, circuits]
 ---

--- a/zk/Lambda_directory_structure.md
+++ b/zk/Lambda_directory_structure.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - DevOps
-  - Backend
 tags: [AWS]
 ---

--- a/zk/Lambda_handler_function.md
+++ b/zk/Lambda_handler_function.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [AWS, aws-lambda, backend]
 ---

--- a/zk/Lambda_programming_model.md
+++ b/zk/Lambda_programming_model.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [AWS, aws-lambda, backend]
 ---

--- a/zk/Lambda_triggers.md
+++ b/zk/Lambda_triggers.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - DevOps
-  - Backend
 tags: [AWS, aws-lambda]
 ---

--- a/zk/Lambdas_in_Python.md
+++ b/zk/Lambdas_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python]
 ---

--- a/zk/Latches.md
+++ b/zk/Latches.md
@ -1,8 +1,4 @@
 ---
-categories:
-  - Computer Architecture
-  - Electronics
-  - Hardware
 tags: [logic-gates, binary, memory]
 ---

--- a/zk/Law_of_Non_Contradiction.md
+++ b/zk/Law_of_Non_Contradiction.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Law_of_the_Excluded_Middle.md
+++ b/zk/Law_of_the_Excluded_Middle.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Lifecycle_methods.md
+++ b/zk/Lifecycle_methods.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/List_comprehension_etc.md
+++ b/zk/List_comprehension_etc.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python]
 ---

--- a/zk/Listing_and_navigating_directories.md
+++ b/zk/Listing_and_navigating_directories.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Lists_and_arrays.md
+++ b/zk/Lists_and_arrays.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
  - data-structures
--- a/zk/Lists_in_Python.md
+++ b/zk/Lists_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, data-structures]
 ---

--- a/zk/Logarithms.md
+++ b/zk/Logarithms.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags: [algebra]
 ---

--- a/zk/Logic_gates.md
+++ b/zk/Logic_gates.md
@ -1,8 +1,4 @@
 ---
-categories:
-  - Computer Architecture
-  - Electronics
-  - Hardware
 tags: [logic-gates, binary]
 ---

--- a/zk/Logical_consistency.md
+++ b/zk/Logical_consistency.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Logical_equivalence.md
+++ b/zk/Logical_equivalence.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Logical_indeterminacy.md
+++ b/zk/Logical_indeterminacy.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Logical_possibility_and_necessity.md
+++ b/zk/Logical_possibility_and_necessity.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Logical_truth_and_falsity.md
+++ b/zk/Logical_truth_and_falsity.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Loops_in_Python.md
+++ b/zk/Loops_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python]
 ---

--- a/zk/Loops_in_bash.md
+++ b/zk/Loops_in_bash.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Managing_environments.md
+++ b/zk/Managing_environments.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/Map_and_filter_in_Python.md
+++ b/zk/Map_and_filter_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python]
 ---

--- a/zk/Map_and_filter_to_reduce.md
+++ b/zk/Map_and_filter_to_reduce.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [javascript]
 ---

--- a/zk/Mapped_types.md
+++ b/zk/Mapped_types.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
 ---
--- a/zk/Maps_and_sets.md
+++ b/zk/Maps_and_sets.md
@ -1,7 +1,4 @@
 ---
-title: Maps and sets
-categories:
-  - Programming Languages
 tags: [javascript]
 ---

--- a/zk/Match_statements_in_Python.md
+++ b/zk/Match_statements_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python]
 ---

--- a/zk/Matter_and_atoms.md
+++ b/zk/Matter_and_atoms.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Electronics
 tags: [physics]
 ---

--- a/zk/Memoization.md
+++ b/zk/Memoization.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/Memory.md
+++ b/zk/Memory.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Computer Architecture
-  - Hardware
 tags: [memory, motherboard]
 ---

--- a/zk/Memory_leaks.md
+++ b/zk/Memory_leaks.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Software Engineering
 tags: [memory]
 ---

--- a/zk/Messaging_services.md
+++ b/zk/Messaging_services.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [AWS]
 ---

--- a/zk/Middleware.md
+++ b/zk/Middleware.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/Mixed_and_improper_fractions.md
+++ b/zk/Mixed_and_improper_fractions.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - fractions
--- a/zk/Modelling_relationships.md
+++ b/zk/Modelling_relationships.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [mongo-db, node-js, mongoose]
 ---

--- a/zk/Module_pattern.md
+++ b/zk/Module_pattern.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DSA
 tags: [OOP]
 ---

--- a/zk/Module_wrapping_at_runtime.md
+++ b/zk/Module_wrapping_at_runtime.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/Modules.md
+++ b/zk/Modules.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/Monitoring_processes_and_resources.md
+++ b/zk/Monitoring_processes_and_resources.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Linux
 tags: [systems-programming]
 ---

--- a/zk/Morgan.md
+++ b/zk/Morgan.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/Motherboard.md
+++ b/zk/Motherboard.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Computer Architecture
-  - Hardware
 tags: [motherboard]
 ---

--- a/zk/Multiple_pointers.md
+++ b/zk/Multiple_pointers.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DSA
 tags: []
 ---

--- a/zk/Multiplexers_and_demultiplexers.md
+++ b/zk/Multiplexers_and_demultiplexers.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Electronics
-  - Hardware
 tags: [logic-gates, binary, nand-to-tetris]
 ---

--- a/zk/Multiplicative_identity.md
+++ b/zk/Multiplicative_identity.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - theorems
--- a/zk/Multiplicative_property_of_negative_one.md
+++ b/zk/Multiplicative_property_of_negative_one.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - theorems
--- a/zk/Multiplying_fractions.md
+++ b/zk/Multiplying_fractions.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - fractions
--- a/zk/Mutations_with_Apollo_Client.md
+++ b/zk/Mutations_with_Apollo_Client.md
@ -1,7 +1,4 @@
 ---
-title: Mutations with Apollo Client
-categories:
-  - Databases
 tags: [graphql]
 ---

--- a/zk/Naming_conventions.md
+++ b/zk/Naming_conventions.md
@ -1,7 +1,4 @@
 ---
-title: Python naming conventions
-categories:
-  - Programming Languages
 tags: [python]
 ---

--- a/zk/Natural_numbers.md
+++ b/zk/Natural_numbers.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
 ---
--- a/zk/Negation_Elimination.md
+++ b/zk/Negation_Elimination.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: []
 ---

--- a/zk/Negation_Introduction.md
+++ b/zk/Negation_Introduction.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: []
 ---

--- a/zk/Negative_exponents.md
+++ b/zk/Negative_exponents.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags: [algebra, exponents]
 ---

--- a/zk/Network_requests_in_Python.md
+++ b/zk/Network_requests_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, APIs]
 ---

--- a/zk/Node_and_MySQL_db.md
+++ b/zk/Node_and_MySQL_db.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - DevOps
-  - Databases
 tags: [docker, SQL, node-js]
 ---

--- a/zk/Nodemon.md
+++ b/zk/Nodemon.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/Non_null_assertion.md
+++ b/zk/Non_null_assertion.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
 ---
--- a/zk/None_in_Python.md
+++ b/zk/None_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, data-types]
 ---

--- a/zk/Numbers_in_Python.md
+++ b/zk/Numbers_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, data-types]
 ---

--- a/zk/Object_language_and_meta_language.md
+++ b/zk/Object_language_and_meta_language.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Observer_pattern.md
+++ b/zk/Observer_pattern.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DSA
 tags: [OOP]
 ---

--- a/zk/Ohms_Law.md
+++ b/zk/Ohms_Law.md
@ -1,7 +1,4 @@
 ---
-title: Ohm's Law
-categories:
-  - Electronics
 tags: [physics, electricity]
 ---

--- a/zk/OpenSearch.md
+++ b/zk/OpenSearch.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [AWS]
 ---

--- a/zk/Order_of_operations.md
+++ b/zk/Order_of_operations.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
 ---
--- a/zk/Package_management.md
+++ b/zk/Package_management.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/Pacman.md
+++ b/zk/Pacman.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Linux
 tags: []
 ---

--- a/zk/Partitions.md
+++ b/zk/Partitions.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Linux
-  - Operating Systems

 tags:
  - disks
--- a/zk/Passing_arguments_and_options_to_Bash_scripts.md
+++ b/zk/Passing_arguments_and_options_to_Bash_scripts.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Ports.md
+++ b/zk/Ports.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/Practical_walkthrough_Lambda_creation_within_AWS.md
+++ b/zk/Practical_walkthrough_Lambda_creation_within_AWS.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - DevOps
-  - Backend
 tags: [AWS, aws-lambda, node-js]
 ---

--- a/zk/Prefixes_for_units_of_electrical_measurement.md
+++ b/zk/Prefixes_for_units_of_electrical_measurement.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Electronics
 tags: [physics, electricity, exponents]
 ---

--- a/zk/Prime_factorization.md
+++ b/zk/Prime_factorization.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - number-theory
--- a/zk/Primes_and_composites.md
+++ b/zk/Primes_and_composites.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - number-theory
--- a/zk/Primitive_types.md
+++ b/zk/Primitive_types.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
  - data-types
--- a/zk/Processes.md
+++ b/zk/Processes.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Prop_types.md
+++ b/zk/Prop_types.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/Proper_shebang_syntax.md
+++ b/zk/Proper_shebang_syntax.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Props.md
+++ b/zk/Props.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
  - react
@ -31,8 +29,7 @@ They are mostly interchangeable but there are some specific differences

  ```ts
  interface Window {
-    title: string;
-  }
+      }

  interface Window {
    ts: TypeScriptAPI;
--- a/zk/Prototypical_inheritance.md
+++ b/zk/Prototypical_inheritance.md
@ -1,7 +1,4 @@
 ---
-title: Prototypical inheritance
-categories:
-  - Programming Languages
 tags: [javascript, OOP]
 ---

--- a/zk/Python_data_types.md
+++ b/zk/Python_data_types.md
@ -1,7 +1,4 @@
 ---
-title: Python data-types
-categories:
-  - Programming Languages
 tags: [python, data-types]
 ---

--- a/zk/Python_execution.md
+++ b/zk/Python_execution.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, data-types]
 ---

--- a/zk/Python_interpreter.md
+++ b/zk/Python_interpreter.md
@ -1,7 +1,4 @@
 ---
-title: Python interpreter
-categories:
-  - Programming Languages
 tags: [python]
 ---

--- a/zk/Python_modules_and_imports.md
+++ b/zk/Python_modules_and_imports.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, OOP]
 ---

--- a/zk/Python_package_management.md
+++ b/zk/Python_package_management.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, data-types]
 ---

--- a/zk/Querying_a_collection.md
+++ b/zk/Querying_a_collection.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [mongo-db, node-js, mongoose]
 ---

--- a/zk/Queue.md
+++ b/zk/Queue.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DSA
 tags:
  - data-structures
 ---
--- a/zk/Quote_marks_in_Bash.md
+++ b/zk/Quote_marks_in_Bash.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/RESTful_APIs.md
+++ b/zk/RESTful_APIs.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [APIs, REST]
 ---

--- a/zk/Read.md
+++ b/zk/Read.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Rebasing.md
+++ b/zk/Rebasing.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags:
  - git
 ---
--- a/zk/Reciprocals.md
+++ b/zk/Reciprocals.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - fractions
--- a/zk/Recursion.md
+++ b/zk/Recursion.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DSA
 tags:
  - algorithms
  - data-structures
--- a/zk/Redirect_to_dev_null.md
+++ b/zk/Redirect_to_dev_null.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Redirection.md
+++ b/zk/Redirection.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Reducing_fractions.md
+++ b/zk/Reducing_fractions.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - fractions
--- a/zk/Regular_expressions_in_SQL.md
+++ b/zk/Regular_expressions_in_SQL.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL, relational-databases, regex]
 ---

--- a/zk/Reiteration.md
+++ b/zk/Reiteration.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: []
 ---

--- a/zk/Relation_between_kernel_and_CPU.md
+++ b/zk/Relation_between_kernel_and_CPU.md
@ -1,8 +1,4 @@
 ---
-categories:
-  - Linux
-  - Operating Systems
-  - Hardware
 tags:
  - kernel
  - CPU
--- a/zk/Relational_database_architecture.md
+++ b/zk/Relational_database_architecture.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [relational-databases]
 ---

--- a/zk/Remote_tracking_branches.md
+++ b/zk/Remote_tracking_branches.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [git]
 ---

--- a/zk/Rename_a_branch.md
+++ b/zk/Rename_a_branch.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [git, procedural]
 ---

--- a/zk/Reset_to_remote_version.md
+++ b/zk/Reset_to_remote_version.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [git, procedural]
 ---

--- a/zk/Resistance.md
+++ b/zk/Resistance.md
@ -1,7 +1,4 @@
 ---
-title: Resistance
-categories:
-  - Electronics
 tags: [physics, electricity]
 ---

--- a/zk/Restructure_URLs.md
+++ b/zk/Restructure_URLs.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [AWS, aws-lambda, backend]
 ---

--- a/zk/Retrieve_data_from_SQL_table.md
+++ b/zk/Retrieve_data_from_SQL_table.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL, relational-databases]
 ---

--- a/zk/Role_of_unique_key_in_relational_databases.md
+++ b/zk/Role_of_unique_key_in_relational_databases.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [relational-databases]
 ---

--- a/zk/Routing_on_link_click.md
+++ b/zk/Routing_on_link_click.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/Rules_for_operations_on_like_and_unlike_terms.md
+++ b/zk/Rules_for_operations_on_like_and_unlike_terms.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
 ---
--- a/zk/S3.md
+++ b/zk/S3.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [AWS]
 ---

--- a/zk/Save_readonly_Vim_file.md
+++ b/zk/Save_readonly_Vim_file.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Linux
-  - Networks
 tags: []
 ---

--- a/zk/Schema_Definition_Language.md
+++ b/zk/Schema_Definition_Language.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [graphql]
 ---

@ -48,8 +46,7 @@ For example if we had this type:
 ```graphql
 type Track {
  id: ID!
-  title: String!
-  author: Author!
+    author: Author!
  thumbnail: String
  length: Int
  modulesCount: Int
--- a/zk/Secrets_or_env_vars.md
+++ b/zk/Secrets_or_env_vars.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - DevOps
-  - Backend
 tags: [AWS, aws-lambda]
 ---

--- a/zk/Semantic_versioning.md
+++ b/zk/Semantic_versioning.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Software Engineering
 tags: []
 ---

--- a/zk/Sets_in_Python.md
+++ b/zk/Sets_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, data-structures]
 ---

--- a/zk/Setup_configuration.md
+++ b/zk/Setup_configuration.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
 ---
@ -84,8 +82,7 @@ using standard ES6 imports:

 ```tsx
 export type Article = {
-	title: string,
-	price: number,
+		price: number,
 }

 export type AnotherType = {
--- a/zk/Shell_cheat_sheet.md
+++ b/zk/Shell_cheat_sheet.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Linux
-  - Programming Languages
 tags: [shell]
 ---

--- a/zk/Shell_sessions.md
+++ b/zk/Shell_sessions.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Signed_and_unsigned_numbers.md
+++ b/zk/Signed_and_unsigned_numbers.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Computer Architecture
 tags: [binary, binary-encoding]
 ---

--- a/zk/Singleton_pattern.md
+++ b/zk/Singleton_pattern.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DSA
 tags: [OOP]
 ---

--- a/zk/Sliding_window.md
+++ b/zk/Sliding_window.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DSA
 tags: []
 ---

--- a/zk/Solving_equations.md
+++ b/zk/Solving_equations.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags: [algebra]
 ---

--- a/zk/Sorting_lists_in_Python.md
+++ b/zk/Sorting_lists_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python]
 ---

--- a/zk/Soundness.md
+++ b/zk/Soundness.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Split_into_array.md
+++ b/zk/Split_into_array.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Stacks.md
+++ b/zk/Stacks.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DSA
 tags:
  - data-structures
 ---
--- a/zk/Stale_branches_and_pruning.md
+++ b/zk/Stale_branches_and_pruning.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [git]
 ---

--- a/zk/Step_functions_and_state_machines.md
+++ b/zk/Step_functions_and_state_machines.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [AWS]
 ---

--- a/zk/Stout_stin.md
+++ b/zk/Stout_stin.md
@ -1,7 +1,4 @@
 ---
-title: Standard input and output
-categories:
-  - Programming Languages
 tags: [python, data-types]
 ---

--- a/zk/Strategies_for_constructing_proofs.md
+++ b/zk/Strategies_for_constructing_proofs.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Streams.md
+++ b/zk/Streams.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/Strings_in_Python.md
+++ b/zk/Strings_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, data-types]
 ---

--- a/zk/Strings_in_bash.md
+++ b/zk/Strings_in_bash.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
  - data-types
--- a/zk/Structuring_Express_applications.md
+++ b/zk/Structuring_Express_applications.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [backend, node-js, REST, APIs, mongo-db]
 ---

--- a/zk/Substrings_in_Bash.md
+++ b/zk/Substrings_in_Bash.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Swap_space.md
+++ b/zk/Swap_space.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Linux
-  - Operating Systems
 tags:
  - memory
  - disks
--- a/zk/Switch_between_Python_vers.md
+++ b/zk/Switch_between_Python_vers.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python]
 ---

--- a/zk/Syllogism.md
+++ b/zk/Syllogism.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Symlinks.md
+++ b/zk/Symlinks.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Syntax_of_propositional_logic.md
+++ b/zk/Syntax_of_propositional_logic.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Tags_in_Git.md
+++ b/zk/Tags_in_Git.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [git]
 ---

--- a/zk/Test_values_in_Bash.md
+++ b/zk/Test_values_in_Bash.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
  - regex
--- a/zk/Testing_Python_code.md
+++ b/zk/Testing_Python_code.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, testing]
 ---

--- a/zk/Testing_with_Jest.md
+++ b/zk/Testing_with_Jest.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [javascript, testing, jest]
 ---

--- a/zk/Text_manipulation.md
+++ b/zk/Text_manipulation.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/The_Kernel.md
+++ b/zk/The_Kernel.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Operating Systems
 tags: [systems-programming, memory]
 ---

--- a/zk/The_Little_Man_computer.md
+++ b/zk/The_Little_Man_computer.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Computer Architecture
 tags: [CPU]
 ---

--- a/zk/The_PATH.md
+++ b/zk/The_PATH.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/The_Pragmatic_Programmer_1999.md
+++ b/zk/The_Pragmatic_Programmer_1999.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Software Engineering
 tags: []
 ---

--- a/zk/Theorems_and_empty_sets.md
+++ b/zk/Theorems_and_empty_sets.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Three_bit_counter.md
+++ b/zk/Three_bit_counter.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Electronics
-  - Hardware
 tags: [logic-gates, binary, memory, clock]
 ---

--- a/zk/Transistors.md
+++ b/zk/Transistors.md
@ -1,8 +1,4 @@
 ---
-title: Transistors
-categories:
-  - Electronics
-  - Hardware
 tags: [logic-gates, binary]
 ---

--- a/zk/Troubleshooting.md
+++ b/zk/Troubleshooting.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Linux
 tags: [mongo-db]
 ---

--- a/zk/Truth_functional_connectives.md
+++ b/zk/Truth_functional_connectives.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Truth_tables.md
+++ b/zk/Truth_tables.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Mathematics
-  - Logic
 tags: []
 ---

--- a/zk/Truth_trees.md
+++ b/zk/Truth_trees.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags: []
 ---

--- a/zk/Tuples_in_Python.md
+++ b/zk/Tuples_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, data-structures]
 ---

--- a/zk/Turing_machines.md
+++ b/zk/Turing_machines.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Computer Architecture
 tags:
  - theory-of-computation
 ---
--- a/zk/Type_guarding_narrowing.md
+++ b/zk/Type_guarding_narrowing.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
 ---
--- a/zk/Type_hinting.md
+++ b/zk/Type_hinting.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, types]
 ---

@ -54,8 +52,7 @@ interfaces as follows:
 ```py
 class ArticleInfo(TypedDict):
    timestamp: str
-    article_title: str
-    link: str
+    article_    link: str
 ```

 We could then use it thus:
--- a/zk/Union_types.md
+++ b/zk/Union_types.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
 ---
--- a/zk/Unknown.md
+++ b/zk/Unknown.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - typescript
 ---
--- a/zk/Update_an_SQL_table.md
+++ b/zk/Update_an_SQL_table.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL, relational-databases]
 ---

--- a/zk/Update_document.md
+++ b/zk/Update_document.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [mongo-db, node-js, mongoose]
 ---

--- a/zk/Update_existing_data_in_SQL_table.md
+++ b/zk/Update_existing_data_in_SQL_table.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL, relational-databases]
 ---

--- a/zk/Useful_operators_in_SQL.md
+++ b/zk/Useful_operators_in_SQL.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL, relational-databases]
 ---

--- a/zk/User_Space.md
+++ b/zk/User_Space.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Operating Systems
-  - Linux
 tags:
 ---

--- a/zk/User_management.md
+++ b/zk/User_management.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Linux
 tags: []
 ---

--- a/zk/User_management_on_AWS.md
+++ b/zk/User_management_on_AWS.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [AWS]
 ---

--- a/zk/Using_GraphQL_with_Node.md
+++ b/zk/Using_GraphQL_with_Node.md
@ -1,7 +1,4 @@
 ---
-title: Using GraphQL with Node.js
-categories:
-  - Databases
 tags: [graphql, node-js]
 ---

--- a/zk/Using_arguments_with_Apollo_Client.md
+++ b/zk/Using_arguments_with_Apollo_Client.md
@ -1,7 +1,4 @@
 ---
-title: Using arguments with Apollo Client
-categories:
-  - Databases
 tags: [graphql]
 ---

@ -37,8 +34,7 @@ type Query {

 type Track {
    id: ID!
-    title: String!
-    authorId: String! // They added this on the sly
+        authorId: String! // They added this on the sly
    thumbnail: String
    length: Int
    modulesCount: Int
@ -49,8 +45,7 @@ type Track {

 type Module {
    id: ID!
-    title: String!
-    length: Int
+        length: Int
 }

 type Author {
@ -152,8 +147,7 @@ author name is not a field on `Track`, it is a field on `Author`:
 ```js
 type Track {
  id: ID!
-  title: String!
-  authorId: String!
+    authorId: String!
  thumbnail: String
  length: Int
  modulesCount: Int
@ -193,8 +187,7 @@ Here's a reminder of the `Module` type:
 ```js
 type Module {
    id: ID!
-    title: String!
-    length: Int
+        length: Int
 }
 ```

--- a/zk/Utilities,_operators,_flags.md
+++ b/zk/Utilities,_operators,_flags.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Validating_Mongoose_schemas.md
+++ b/zk/Validating_Mongoose_schemas.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [mongo-db, mongoose, node-js]
 ---

--- a/zk/Validation.md
+++ b/zk/Validation.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [backend, node-js, REST, APIs]
 ---

--- a/zk/Validity_and_entailment.md
+++ b/zk/Validity_and_entailment.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Logic
 tags: [propositional-logic]
 ---

--- a/zk/Variable_indirection.md
+++ b/zk/Variable_indirection.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Variables_and_data_types.md
+++ b/zk/Variables_and_data_types.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Viewing_remote_changes_without_merging.md
+++ b/zk/Viewing_remote_changes_without_merging.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - DevOps
 tags: [git]
 ---

--- a/zk/Views_in_relational_databases.md
+++ b/zk/Views_in_relational_databases.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Databases
 tags: [relational-databases]
 ---

--- a/zk/Virtual_memory_and_the_MMU.md
+++ b/zk/Virtual_memory_and_the_MMU.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Computer Architecture
-  - Hardware
 tags: [memory]
 ---

--- a/zk/Voltage.md
+++ b/zk/Voltage.md
@ -1,7 +1,4 @@
 ---
-title: Voltage
-categories:
-  - Electronics
 tags: [physics, electricity]
 ---

--- a/zk/Voltage_sources.md
+++ b/zk/Voltage_sources.md
@ -1,7 +1,4 @@
 ---
-title: Voltage sources
-categories:
-  - Electronics
 tags: [physics, electricity]
 ---

--- a/zk/What_are_disks.md
+++ b/zk/What_are_disks.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Linux
-  - Operating Systems
 tags:
  - disks
 ---
--- a/zk/Whole_numbers.md
+++ b/zk/Whole_numbers.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
 ---
--- a/zk/Why_computers_use_binary.md
+++ b/zk/Why_computers_use_binary.md
@ -1,8 +1,4 @@
 ---
-title: Why computers use binary
-categories:
-  - Mathematics
-  - Computer Architecture
 tags: [binary]
 ---

--- a/zk/Wildcards_in_SQL.md
+++ b/zk/Wildcards_in_SQL.md
@ -1,7 +1,4 @@
 ---
-categories:
-  - Databases
-  - Programming Languages
 tags: [SQL, relational-databases]
 ---

--- a/zk/Working_with_numbers_in_Bash.md
+++ b/zk/Working_with_numbers_in_Bash.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - shell
 ---
--- a/zk/Zero_property_of_multiplication.md
+++ b/zk/Zero_property_of_multiplication.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Mathematics
 tags:
  - prealgebra
  - theorems
--- a/zk/Zip_function_in_Python.md
+++ b/zk/Zip_function_in_Python.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags: [python, data-structures]
 ---

--- a/zk/events.md
+++ b/zk/events.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/fs.md
+++ b/zk/fs.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/http.md
+++ b/zk/http.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/journald.md
+++ b/zk/journald.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Linux
 tags: [systems-programming]
 ---

--- a/zk/process.md
+++ b/zk/process.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js
--- a/zk/systemd.md
+++ b/zk/systemd.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Linux
 tags: [systems-programming]
 ---

--- a/zk/useContext.md
+++ b/zk/useContext.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/useEffect.md
+++ b/zk/useEffect.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/useReducer.md
+++ b/zk/useReducer.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/useState.md
+++ b/zk/useState.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - javascript
  - react
--- a/zk/v8.md
+++ b/zk/v8.md
@ -1,6 +1,4 @@
 ---
-categories:
-  - Programming Languages
 tags:
  - backend
  - node-js