The same way we have flags for avoiding indexing and scanning forks or repositories on personal namespaces, we should add one for ignoring repositories that are marked as private, in both GitLab and GitHub.

Seems like basic functionality. Promoting projects without linking to them seems a bit incoherent...

For instance, the with-output-to-stream page should link to the official GitHub repo and [the official homepage](https://www.hexstreamsoft.com/libraries/wi