I would like to see GitHub/GitLab adding a section like SO to the repos, slowly it would build more updated content and the repo owners could moderate. I think the amount of centralized knowledge in SO is not good for the web.
This. Issues are often used as interactive FAQs and it feels weird to have to go to SO if I don’t want to pollute a project’s issues just to ask a question.
That knowledge is all licensed Creative Commons, it's not owned by SO. (Although, which Creative Commons license is entirely unclear right now...)