Enforce pre-commit in this repo

[manics]

Proposed change

We have a .pre-commit-config.yaml config file in this repo, but we don't enforce it. We should enforce it.

Alternative options

Delete .pre-commit-config.yaml if we're not going to enforce it

Who would use this feature?

Developers

(Optional): Suggest a solution

Either activate pre-commit.ci, or add a GH workflow to run https://github.com/pre-commit/action

[manics]

I've enabled this repo in pre-commit.ci