refactor: make entire project typecheck with root tsconfig

[Josh-Cena]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

Again, using type-aware linting requires the root tsconfig to include all files (else we would need to create a TS Program for every package, which absolutely OOMs). However, the website folder uses a different tsconfig that doesn't extend the root. In this case, I've separated the website project out so it's type-checked alone, unaffected by the root.

Test Plan

The __tests__ files still don't typecheck. However, now when you exclude them from the root tsconfig, there aren't any type errors when you run yarn tsc at the root, only a few reports about export =, because in this single-run tsc, module is set to esnext.

Test links

Deploy preview: https://deploy-preview-_____--docusaurus-2.netlify.app/

Related issues/PRs

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 69	🟢 100	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 81	🟢 99	🟢 100	🟢 100	🟢 90	Report

[github-actions]

Size Change: 0 B

Total Size: 796 kB

ℹ️ View Unchanged

Filename	Size
website/.docusaurus/globalData.json	52.3 kB
website/build/assets/css/styles.********.css	106 kB
website/build/assets/js/main.********.js	599 kB
website/build/index.html	38.9 kB

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