feat: onboard to create-typescript-app with pnpm support

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing issue: fixes Tooling: Migrate to create-typescript-app@1 #1318
• That issue was marked as status: accepting prs

Overview

In preparation for a full monorepo migration and rename (#1314), this migrates as-is to create-typescript-app. That way I can get all these rote changes (more linting, tabs, etc.) out of the way before making the big jump to a monorepo & separate packages.

As part of this, adds a fix for pnpm's node_modules/ symlink resolution: 1e989a7

Replaces the mz runtime dependency with node:fs and node:fs/promises uses.

💖

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[rubiesonthesky]

There are both renovate.json and dependabot.yml - are both used? :)

[rubiesonthesky]

Quickly checked this locally and I think everything looks and works a lot better!

[JoshuaKGoldberg]

There are both renovate.json and dependabot.yml - are both used? :)

Ha, good catch, will remove dependabot. Thanks 👍