black for formatting, ruff for linting

[mdbenito]

I hit this while submitting #29: The makefile uses ruff format but CI uses black. Unless there is a strong preference for the few differences in black's formatting, I think it should be dropped in favour of ruff as a single tool in CI.

Otherwise, I believe the Makefile, readme, and pyproject should be updated to reflect the use of black.

Happy to do either of both.

[adsharma]

There is also the pre-commit hook. Actual workflow uses a specific version of black. Let's update the Makefile and any other docs to mention black for formatting and ruff for linting.

[mdbenito]

I have a branch with just that. Coming up!