[docs] fix many links

[Conduitry]

These links were pointing to an anchor on this page that no longer exists.

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: /~https://github.com/sveltejs/rfcs
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• Ideally, include a test that fails without this PR but passes with it.

Tests

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[changeset-bot]

🦋 Changeset detected

Latest commit: ffc8045

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@sveltejs/kit	Patch

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[Conduitry]

Oh, I didn't realize these were published as part of the package and pulled in for the ambient types. I'll add a changeset.

[Conduitry]

I ran into some more broken links, and then tried to take a sweep through the repo for as many as I could find, and then added them on to this PR. We really gotta automate this. At some point I'm going to try looking into how this could happen during linting.