feat(git): add comprehensive git folder management commands and update documentation

bin/ls-git-folder

@@ -1,9 +1,10 @@
 #!/usr/bin/env bash
 
-#!/usr/bin/env bash
-
 ls-git-folder() {
-    [[ -z "$1" ]] && { echo '$1 is empty.' >&2; return 1; }
+    if [[ -z "$1" ]]; then
+        echo '$1/path is empty.'
+        exit
+    fi
     [[ ! -d "$1" ]] && { echo "Error: '$1' is not a directory." >&2; return 1; }
 
     local excludes="${GIT_FOLDER_EXCLUDE:-.cache,node_modules,venv,__pycache__,.vim,.fzf,.password-store,.oh-my-zsh}"
@@ -18,6 +19,6 @@ ls-git-folder() {
     find_cmd="$find_cmd -type d -name '.git' -print"
 
     eval "$find_cmd" 2>/dev/null | while IFS= read -r git_dir; do
-        dirname "$git_dir"
+        [[ "$git_dir" != "./.git" ]] && dirname "$git_dir"
     done
 }