Next revalidate page in mutation/query

[Zeko369]

Closes: #3598

What are the changes and their implications?

Feature Checklist

• [x] decorate blitzCtx with .revalidatePage
• [x] make our .revalidatePage accept Routes
• [x] throw error if called in SP (could lead to recursion and bugs + would be hard to implement)
• [x] DOCS: https://github.com/blitz-js/blitzjs.com/pull/717

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 0b17d0779dc224da98644eeca77920ea32aa3ba8

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR