feat: better git-root and git-home for exec

.gitconfig

@@ -2,10 +2,9 @@
   diff-words = diff --color-words='[^[:space:]]|([[:alnum:]]|UTF_8_GUARD)+'
 	st = status
   cm = commit
-  home = rev-parse --show-toplevel 
-	exec = "!exec "
   # TODO use git-delta
-  # those are just for tab completion
+  # the following aliases are defined as bash scripts, only here for completion
+  home = "!git-home"
   root = "!git-root"
   ignore = "!git-ignore"
 [color]