Why GitBook needs access to my orgs ? Pff... Looks promising but I can't use it with GitHub... Thanks for sharing.
Update, I find this : github.com/azerupi/mdBook, seems good.
You can choose to let GitBook store your books in a GitHub repo.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.