add deprecation notice

[fubhy]

Before archiving this repository, we should triage and move all issues and PRs over.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1f343ef

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.

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