Including IronFox in F-Droid official repo

Hello !

After Mull ceased development, there's a lot of uncertainty on whether someone will pick it up and continue where Mull stopped.

Well, there's already IronFox, a fork from Mull which was recently created. I'd love to install it from F-Droid, and to have early F-Droid adoption, now that its build scripts haven't diverged much from Mull, and I guess they already support F-Droid integration.

This would be just great at this stage.

Thanks a lot !