Display a "source" link when the homepage of a github/bitbucket repo was overridden

[FichteFoll]

Often times I want to browse a package's source code and search for it using the package listing. Then, every time a plugin author has set a different homepage I have to go to the issues link and then to the main repo which is kind of annoying.

(I don't know a single situation where I personally wanted to go to a site's "homepage" instead of the repo to check the source code.)

[wbond]

This sounds like it should be part of a new version of the repository schema. There isn't a deterministic way to go from either issues or homepage to source code since they can be custom. Also, some packages don't provide source.

[FichteFoll]

Yes, it could be a new key that can be read from details. However, if source and homepage are the same url, we don't need both.