Incorporate github commits into project pages

Many projects are worked on by people not attending hack nights, or don't get good updates written up. It would be great to leverage the github API to pull recent commit activity into project pages, both to provide information and to make it easier to tell that projects are live.

(Obviously this only applies to github-based projects, but the reality is that most are.)

No files, tests, or entry points are named. Locate how project pages are rendered and where GitHub API access belongs, then determine how recent commit activity should be displayed; done means GitHub-based project pages show useful recent commits without affecting non-GitHub projects.

Written by the indexing model from the issue text.