Point plugin links to the new separate repos

[Pezmc]

Description

Update the plugin documentation to point to the new package repositories now they've been moved out of core (see #11158)

Partial fix of #11192

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[Pezmc]

I'm closing this PR since it seems like the changes have already been made, even though the changes were showing against main before I opened the PR 🤷 . It's not reflected on the website yet.

[patak-dev]

You can use https://main.vitejs.dev/ to see the latest changes from main. https://vitejs.dev/ is currently showing the docs for v3

[Pezmc]

The change to the docs should be backported though, right? Since the issue is that the links on the v3 website are broken.

[patak-dev]

Ah, yes, good point. We have also a https://v3.vitejs.dev we will keep (also v2, but probably too far already). If you would like you can PR this change to the v3 branch.