📝 Documentation: Add an npm2yarn equivalent for installation instructions in docs site

[JoshuaKGoldberg]

Bug Report 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

The three code blocks under Installation on the docs site are a lot of vertical space:

It'd be nice to use something like the popular @docusaurus/remark-plugin-npm2yarn to turn that into a single tabbed area. Accepting PRs!

Additional Info

An example of the npm2yarn plugin in the wild is on https://typescript-eslint.io/getting-started/#step-1-installation:

...though npm2yarn, as its name suggests, doesn't seem to support pnpm in that tab example. Maybe a new package needs to be made? Or a configuration option added somewhere?

I haven't found any TypeDoc plugin that does this (though admittedly I haven't looked very hard). I think finding an existing plugin would be the best solution, or if one doesn't exist creating it. That way other folks can benefit from this!