chore(v2): bump/align deps in monorepo: commander, semver, fs-extra

[Simek]

Motivation

This is the first of "N" PRs in which I'm trying to cleanup the Docusaurus workspace, normalize and if possible reduce number of dependencies, check for some redundancies which might were created during rapid development in the last months.

This PR normalizes the version of three packages across the workspace (skipping V1 packages):

• commander (the Commander bump in core required the TS type adjustment, which was expected, according to the release notes - https://github.com/tj/commander.js/releases/tag/v5.0.0)
  • also the correct for v5 type has been used already inside main Docusaurus types for extendCli - https://github.com/facebook/docusaurus/blob/master/packages/docusaurus-types/src/index.d.ts#L232 - because plugin-content-docs was already using v5 - https://github.com/facebook/docusaurus/blob/master/packages/docusaurus-plugin-content-docs/package.json#L23
• fs-extra
• semver

To make the reviews easier I'm trying to keep the batches in PRs quite small, so

Have you read the Contributing Guidelines on pull requests?

Yes.

Test Plan

Successful build on local machine + successful Docusaurus 2 website start on localhost.

Related PRs

Not yet.

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⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟢 Performance	91
🟢 Accessibility	96
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

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Size Change: 0 B

Total Size: 543 kB

ℹ️ View Unchanged

Filename	Size	Change
website/build/assets/css/styles.********.css	86.6 kB	0 B
website/build/assets/js/main.********.js	370 kB	0 B
website/build/blog/2017/12/14/introducing-docusaurus/index.html	60.5 kB	0 B
website/build/docs/introduction/index.html	235 B	0 B
website/build/index.html	25.6 kB	0 B

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[slorber]

LGTM, seems safe to merge.

FYI, as there's an ongoing Webpack 5 migration, and we'll also remove v1 from master soon, I'd prefer to avoid too complex deps refactorings in the near future

Also found this package useful to "align deps versions" across a monorepo, but couldn't apply it to docusaurus when I tried it a few months ago (had other errors that I couldn't solve immediately, may be worth trying again) https://github.com/Thinkmill/manypkg