Sync repos which are not github-forks if "homepage" is a git repository

[oledid]

For forking non-github repos.

What is the best way to find out if an url is a valid git repository?

"homepage" is included in repos list as well as details in the github api.

[oledid]

Example case: https://sourceforge.net/p/refind/code/ci/master/tree/