Added functionality to remove empty notebooks/sections

src/includes/delete.sns.sh

@@ -5,6 +5,13 @@ function delete(){
      if [ -e "$NOTES_DIR/$NOTE" ]; then
         rm "$NOTES_DIR/$NOTE"
         printf "  - %s\n" "Deleted note: ${NOTE%.*}."
+        #Cleanup empty notebooks/sections]
+        find "$NOTES_DIR" -mindepth 1 -type d  | tac |\
+         while read -r DIR ; do
+            if [ ! "$(ls -A $DIR)" ]; then
+                rmdir "$DIR"
+            fi
+        done
      else
         >&2 printf "  $RED_COLOR!$RESET_COLOR %s\n" "Note ${NOTE%.*} does not exist."
      fi