Delete images files which names cannot be found in the code base

cleanup_image_files.sh

IMAGES_LOCATION="./"

FILES=`find $IMAGES_LOCATION -not -name '*.scss'`

# loop through the file list, exclude the extension to be very safe
# and remove the files that have no match. This approach is conservative
# since we might keep files that are no used due to a different extension
# but it should not happen a lot
for FILE in $FILES; do
  FULLNAME=$(basename "$FILE")
  BASE="${FULLNAME%%.*}"
  # git grep $BASE  > /dev/null || echo "Would remove $BASE ($FILE)"
  git grep $BASE  > /dev/null || git rm $FILE
done