🚀 Feature: Move sentences-per-line into the formatter, Prettier

[JoshuaKGoldberg]

Feature Request Checklist

• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Overview

Coming over from JoshuaKGoldberg/eslint-plugin-package-json#998 (comment): @michaelfaith brings up a good point that the "one sentence per line" enforcement currently implemented as a Markdownlint rule -https://github.com/JoshuaKGoldberg/sentences-per-line- is really more of a formatter concern.

Summarizing my interpretation (did I read it correctly?):

• The biggest priority is encouraging folks to write docs, since that's often an afterthought & tough ask
• The inconvenience of having a not-often-configured-by-default tool, especially a linter, conflicts with that priority
• The net benefit of keeping to one sentence per line in docs is arguably lesser than the net cost of that inconvenience

Additional Info

I actually have been meaning to rework the other Prettier plugins used in this repo:

• prettier-ignore handling with prettier-plugin-curly buggy prettier/prettier#16951
• 🐛 Bug: prettier plugin collision prettier-plugin-curly#386

...but haven't had the time to really buckle down and figure out how to refactor, say, prettier-plugin-curly to the "right" way of doing things. Once that's figured out I think it'd be good to write a prettier-plugin-sentences-per-line or something like that.

Co-authored-by: @michaelfaith

🎁