feat(git): enhance git folder scripts with validation and error handling for missing submodules and existing directories

bin/sync-git-folder

@@ -11,6 +11,6 @@ sync-git-folder() {
     fi
 
     echo 'Switch and pull git folders.'
-    switch-git-folder "$"
-    pull-git-folder "$1" "$1"
+    switch-git-folder "$1" "$2"
+    pull-git-folder "$1" "$2"
 }