Better document and support auto-generated configs for contributors

[JoshuaKGoldberg]

Quoting @IllusionMH in #696:

I have an impression (may be wrong) that contributors are not sure if they should add/commit changes to automatically generated files (specifically recommended_ruleset.js and tslint-warnings.csv).

It may worth to add information to CONTRIBUTING.md that changes in these files related to new rules should be also commited. And during review check if changes are present and ask to add for example recommended: 'false, // to strict' to rule metadata.

And my response:

Agreed. I think it'd be good to have a comment on top of recommended_ruleset.js linking to those docs too.

I wonder if we should enable them as a commit hook, as with Prettier?

[JoshuaKGoldberg]

☠️ It's time! ☠️

Per #876, this repository is no longer accepting feature pull requests. TSLint is being deprecated and we recommend you switch to https://typescript-eslint.io.

Thanks for open sourcing with us, everyone!