Unsure what remote type should be used for heroku

[lake-effect]

Heroku integrates with git by adding its remotes to a git repository, which confuses browse-at-remote. It's not used for browsing, so it would be helpful to add a "no-op" remote type or something, unless someone has a better idea?

Steps to reproduce:

1. Add a remote like https://git.heroku.com/your-repo.git
2. Try to browse-at-remote

Desired behavior:

Browse-at-remote ignores heroku remotes