Setup pre-commit for repo

[tim-schilling]

To help lower barriers to contributing we should integrate pre-commit to the project. The main use for us would be to run the linter before a commit occurs to help prevent failed tests when PRs are opened. While this does change the setup time, it does conform to a larger python practice. That conformity should theoretically be more accessible when compared to knowing to run make styles before committing.

[matthiask]

I don't use pre-commit much (we use custom hooks) but this definitely sounds like an excellent idea. django-debug-toolbar's make commands always give me a headache.

[tim-schilling]

Yeah, perhaps larger python practice isn't the right phrase. Growing is more appropriate.