chore: migrate to create-typescript-app

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🛠️ Repo: Overhaul development tooling #82
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Changes initially generated by running create-typescript-app:

npx create-typescript-app --auto --mode migrate

Applies some general cleanup:

• Adds general GitHub docs, including: a code of conduct, a development guide, and issue & PR templates
• Adds contribution recognition with All Contributors
• Adds faster installs with pnpm
• Adds formatting with Prettier, using Husky + lint-staged for Git commit hooks
• Adds automated releases with release-it
• Moves the demo app to a demo/ directory
• Replaces JSHint with ESLint for linting
• Replaces QUnit with Vitest for testing

Notably does not tackle these followups:

• 🛠️ Repo: Configure Renovate #90
• 🛠️ Repo: Migrate to TypeScript #91
• 🛠️ Repo: Move demo to native HTML, not Angular + Bootstrap #92
• 🛠️ Repo: Change repo name to package-json-validator #93

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[github-actions]

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