prune: yarn.lock; docs(website): pnpm; chore: enforce pnpm

[JeromeFitz]

Addition to #18

• Enforce pnpm at the root install for workspaces
• Removes old yarn.lock files from the move to pnpm
• Contributors for localized ./website development for cmdk should use pnpm
  • Separate from the overall README which people can install cmdk via their preferred package manager

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Name	Status	Preview	Updated
cmdk-website	✅ Ready (Inspect)	Visit Preview	Aug 18, 2022 at 1:06AM (UTC)

[JeromeFitz]

This is really cool (understatement) and congrats on the release (also understatement)! 🚀

If you prefer an issue creation first, I understand. Please let me know if you have any questions or prefer any changes.

▲ cmdk [chore/yarn-removal] yarn install
yarn install v1.22.19
info No lockfile found.
$ npx only-allow pnpm
╔═════════════════════════════════════════════════════════════╗
║                                                             ║
║   Use "pnpm install" for installation in this project.      ║
║                                                             ║
║   If you don't have pnpm, install it via "npm i -g pnpm".   ║
║   For more details, go to https://pnpm.js.org/              ║
║                                                             ║
╚═════════════════════════════════════════════════════════════╝
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.