Create img purge script and apply

_scripts/clean_image_directory.sh

@@ -1,5 +1,6 @@
 #!/bin/bash
 
+# If there are images in _img/ that are not being used in the workspace, delete them   
 find /home/thomas/repos/computer_science/img -type f | while read filename; do
     rg "${filename##*/}" ../ --type markdown >/dev/null 2>&1
     if [ "$?" -eq 1 ]; then
@@ -7,5 +8,3 @@ find /home/thomas/repos/computer_science/img -type f | while read filename; do
         rm $filename
     fi
 done
-
-