Update and reduction

[MattWellie]

Looking for some feedback here - this repo was out of date relative to ones with decent activity. This is an update/upgrade(?)

• isort removed, ruff does that
• black removed, ruff does that (?) - I've used black forever, but other than a general familiarity with it, I don't see a reason to keep it just for functionality ruff contains
• markdownlint config & usage removed, ruff does that (?)
• tool versions bumped

Specifically I'm not sure on the interaction between COM812 and split-on-trailing-comma = false - do we want to split all lists with trailing commas even if they'll fit on one line (for more meaningful git diffs in future), or condense lists that will fit on a single line for overall file size/line count?

supersedes #15? (sorry, hadn't seen that)

[illusional]

I think you've copied a lot from production-pipelines, which has a different from what we'd recommend. I'd want to keep markdownlint, and I'm not 100% confident on removing black, I think I'd like to discuss that more before we move forward with that.

If you can clean-up production-pipeline carryover (removed markdown lint, some large_file exclude, lots of changes in pyproject.toml), and keep black - happy to re-review.

[illusional]

@MattWellie, otherwise I'm more likely conservitely update #15, merge that and then leave this as a suggestion to discuss.