Reminder that this exists: https://git.zx2c4.com/cgit/ and is the preferred implementation of "web frontend to git" by Linus himself (ahem the creator of git)
cgit is a great git web frontend (I'm the guy who set it up on git.xfce.org back in 2009 or so), but it's a far cry from a full-project management solution like GH (or GitLab, or Bitbucket, or even Sourceforge, of all things).