> In addition, it is best to use code navigation simply in a web browser.

IMHO the vanilla Github UI sucks for code browsing since it's incredibly slow, and the search is also useless (the integrated web-vscode works much better - e.g. press '.' inside a Github project).

> as well as a well-formed CI system with many developed actions and free runners

The only good about the Github CI system are the free runners (including free Mac runners), for everything else it's objectively worse than the alternatives (like Gitlab CI).