A new documentation section for Gitea Actions. Some content comes from: - [Hacking on Gitea Actions](https://blog.gitea.io/2023/03/hacking-on-gitea-actions/) - The README of [act_runner](https://gitea.com/gitea/act_runner) - @ChristopherHX's excellent overview of the differences between Gitea Actions and GitHub Actions in [this comment](https://github.com/go-gitea/gitea/issues/13539#issuecomment-1448888850). --------- Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
