Merge: nitrpg: Move `nitrpg` to its own repository

`nitrpg` is broken since a long time. I think https:/api.github.com actually changed twice since it broke. I don't plan on killing it yet but I moved it to its own repository until I worked again on it (or never).

See https://github.com/Morriar/nitrpg.

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>

Pull-Request: #2755