Replace references to vite/client with astro/client

[matthewp]

What kind of changes does this PR include?

• New or updated content

Description

In withastro/astro#3851 we are replacing vite/client types with our own astro/client. This is so that we can make changes to the types you see in frontmatter.

This updates our docs to reflect the new location.

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[delucis]

Thanks @matthewp! Could you remove the changes from non-/en/ pages? We usually leave those to our translators so they can make sure all the surrounding context gets updated correctly (some of the updated code samples still mention “Vite” in their accompanying comments for example).

[matthewp]

@delucis If you'd like, but the changes are almost definitely correct and not making the changes means that they are for sure wrong. Would it be better to merge this and if for some reason there's a problem fix that than to leave in docs that we know are wrong?

[delucis]

The issue is that the comments provide context to the code updates and also need updating, e.g. here in Portuguese mentioning “Vite”:

If we merge this as-is, we’ll mark these translations as “up-to-date” in our automated translation tracker (#438) so our translators will never know they need updating.

[delucis]

Thanks @matthewp! LGTM 🙌