Dev docs: Document that we use pre-commit hooks

[benjaoming]

While going over our Docs for Development Installation, I didn't find any mention of pre-commit hooks.

They are to be considered a mandatory part of development (as they are enforced in CI builds) and it's a big disadvantage to miss them in a local setup.

[humitos]

I think it's important to mention this in the contributing guide, for sure. IIRC, we didn't mention this when we started using pre-commit because we weren't 100% sure we will be adopting this pattern. However, I think we are already all on board with the current pattern and we are ready to document it so contributors also run pre-commit on their own PRs.

[htech9]

@humitos
Would you have any recommandation on where is a good location to place this documentation about pre-commit among current menus ?
So that opening a PR would be easier for this current issue.