Add support for a .gitea folder

[dfrrt5r6uyfrt]

Like .github. I actually recommend to use another name, like .templates or something, in order to not be dependent on a specific name.

[metalmatze]

We could also use .github as a fallback if there's no other folder.

[tboerger]

Maybe .scm :)

[lunny]

.gitea and fallback to .github should be OKay!