chore: cleanup old changelogs

[sapphi-red]

Description

https://github.com/vitejs/vite/blob/main/packages/vite/CHANGELOG.md is very long now.
This PR cleanups pre-3 version changelogs.

https://github.com/sapphi-red/vite/blob/616179ee49a1258354487cdbf758825f48d89768/packages/vite/CHANGELOG.md#previous-changelogs-2

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.

[patak-dev]

Interesting. I think this is a good change. We are deciding to break the URL of old changelogs (not a hard break, they will reach the changelog and can then find their way). But we probably can't keep the changelog for all prev versions forever.

[patak-dev]

Ok, we need this #10062