fix: fix retrival of root dir

hog.el

@@ -59,19 +59,7 @@ Can be set in dir-locals to be changed on a per-project basis.")
 
 (defun hog--project-root ()
   "Get the root of the current version controlled project."
-  (let ((submodule-parent
-         (string-trim-right
-          (shell-command-to-string
-           "git rev-parse --show-superproject-working-tree")))
-        (repo (string-trim-right
-               (shell-command-to-string
-                "git rev-parse --show-toplevel"))))
-
-    (let ((repo-root
-           (if (not  (string= submodule-parent ""))
-               submodule-parent repo)))
-      (if (not (string= repo-root ""))
-          (concat repo-root "/") ""))))
+  (vc-root-dir))
 
 (defun hog--get-projects ()
   "Get a list of available Hog projects."