Start with plain old Gramps. It can export to static sites with several different templates. Gramps Web is not easy to host or run. It was designed for some specialized things.

https://gramps-project.org/blog/

Love Fossil-scm and it is super easy to self host, via numerous methods.

If you are not wed to git, and are willing to try something else, why not give Fossil SCM a try. It’s created and maintained by the creator of SQLite. It’s a single executable that provides everything for modern source code management, including a website, and even has an official docker file that just works.

Issue tracking, forum support, email, it’s all there, in a single executable that can serve as both the front and back end depending on how you launch it. And it’s a smaller install than git by itself.

https://textpattern.com/