Update URLs after migrating to GitLab

guidelines/hierarchy.md

 
 [MKit][1] already provides features that can help generate such files.
 
-  [1]: https://github.com/AloisMahdal/mkit
+  [1]: https://gitlab.com/vornet/infra/mkit
 
 
 Example
         └── tfkit       #   from the suite (they meet often, though ;))
             └── ...     # /
 
-  [2]: https://github.com/AloisMahdal/shellfu
+  [2]: https://gitlab.com/vornet/shellfu/shellfu