Delete contributing file
Delete contributing file

It was only created to announce that Kitsune was EOL'd, and that is no longer the case. We should add a useful one in future.
mozilla/kitsune,MikkCZ/kitsune,MikkCZ/kitsune,anushbmx/kitsune,safwanrahman/kitsune,safwanrahman/kitsune,mozilla/kitsune,mozilla/kitsune,anushbmx/kitsune,anushbmx/kitsune,anushbmx/kitsune,safwanrahman/kitsune,MikkCZ/kitsune,MikkCZ/kitsune,mozilla/kitsune,safwanrahman/kitsune