[RFC] Migrate forgeo to its own role

[DO1JLR]

Hello everyone.

As forgejo is becoming a hard fork of gitea, I'm proposing that it be moved to its own ansible role. (See forgejo news.)

What do you think about this?

I think future changes to the forgejo config could benefit from this. And since you can no longer swap the gitea binary with the forgejo binary, I don't see any advantage in keeping it in the same git project.