HACKING.md and CONTRIBUTING.md don't exist
These are linked in the repo's README: https://gitlab.gnome.org/GNOME/gnome-todo/blob/master/README.md
But the pages 404:
https://gitlab.gnome.org/GNOME/gnome-todo/blob/master/HACKING.md
https://gitlab.gnome.org/GNOME/gnome-todo/blob/master/CONTRIBUTING.md
Edited by benjbrandall