Run tests in CI

[matthewp]

• Closes #350
• Deprecates / removes old Makefile and the haunted.js and web.js bundles it created. Use unpkg/esm.sh instead.

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🦋 Changeset detected

Latest commit: 0509cecb009369cea210fe63e1f536d4cc6d465e

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

This PR includes changesets to release 1 package

| Name | Type | | ------- | ----- | | haunted | Major |

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