feat(nx-dev): version picker

[isaacplmann]

Adds a version picker to the footer of nx.dev

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Name	Status	Preview	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	Nov 13, 2024 4:59pm

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✅ Successfully ran 4 targets

• nx affected --targets=lint,test,build,e2e,e2e-ci --base=538a4f27222b418551eadd4416d7f7fa34c1a076 --head=a87f7d2dd1645375cfdc21bfe641c12a789817fb --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=538a4f27222b418551eadd4416d7f7fa34c1a076 --head=a87f7d2dd1645375cfdc21bfe641c12a789817fb
• nx documentation --no-dte

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[juristr]

Couple of comments

• can we stay on the same page when switching version? If the page is not available, ideally we'd just go to /docs if possible (it just happens that we version the entire nx.dev website, but it's the docs which is what the user is interested in
• can we backport this to website-19 etc? otherwise you switch to v19 and there's no version switcher
• side-note: having the version switcher in the footer is not really super visible. maybe that was intentional

[isaacplmann]

Cleaned up the code.

• If we stay on the same page when you switch versions, you could get a 404. I updated the link so that it goes to /docs instead.
• Yes, I can back port it to the older versions after this merges.
• Yes, the version switcher is intentionally in the footer. It isn't a high frequency action. Once someone knows that its there, they'll just always open the version of the docs that they're on. For most people, it just gets in the way if it is at the top.

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