fix(): branch name with multiple / creates an invalid configuration

[davinkevin]

Hi 👋

I use a name convention for branches in my company, often like this: username/foo/bar.

In that context, when this code is evaluated, the result is:

repoCfg.GitHubRemote = "origin/username/foo
repoCfg.GitHubBranch = "bar"

This is off course invalid and prevents the system to work correctly.

Thanks