Migrate from Lerna to Nx

[seyoon20087]

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

Implements and closes #7333

Test Plan

Implements a new toolset as described in #7333

Test links

Migrating from Lerna to Nx: https://nx.dev/migration/adding-to-monorepo
Comparison: https://nx.dev/guides/lerna-and-nx
Configure Nx to use GitHub Actions (if being used): https://nx.dev/ci/monorepo-ci-github-actions

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

Related issues/PRs

#7333
lerna/lerna#2703

[Josh-Cena]

Sorry I wasn't being super clear 😅 I said my main candidate for now is monodeploy, not Nx. I've updated my comment to make it clearer. We have another PR doing literally the same thing (getting rid of Lerna). Thanks for taking time, though! Really appreciate it.

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[Josh-Cena]

@seyoon20087 I feel bad about closing your PRs, but I think we can discuss a bit more before sending the PR. This way, you don't waste your time.

[github-actions]

⚡️ Lighthouse report for the changes in this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 57	🟢 100	🟢 100	🟢 100	🟢 90	View report
/docs/installation	🟠 87	🟢 96	🟢 100	🟢 100	🟢 90	View report