Add support for Codeberg or any Forgejo forge

[JasterV]

Hello! First of all, this project is great! I love it :D

I would love to use it but I don't use Github anymore, I've migrated to Codeberg (A fork of forgejo) and I'd love to be able to use this tool in my Codeberg profile.

I would say that the core implementation of the tool probably doesn't need to change but rather we just need to implement a module that fetches the user's activity using the codeberg API (They have a public REST API where you can query users activity, or even an RSS dedicated for each user)