[fix] Disable meta http-equiv in static amp

[asendia]

Fixes invalid meta http-equiv tags in static amp docs: #4074

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: AMP 'http-equiv' may not appear in tag 'meta' #4074
• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.

Tests

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[changeset-bot]

🦋 Changeset detected

Latest commit: 6bcec44

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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[Rich-Harris]

Thank you!