Instead of a pure git hosting site, you might also consider a git-based wiki, such as one hosted by Branchable (http://www.branchable.com/), which additionally runs purely on free software (some of it AGPL licensed, too).
(I am partly responsible for Branchable; the software is by Joey Hess.)
Copyright © 2018, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds