This commit adds provenance for all published packages. See the NPM documentation [0].
Provenance will allow people to verify that the headlessui packages were actually built on GH Actions and with the content of the corresponding commit. This will help with supply chain security.
For this to work, the `id-token` permission was added only where necessary.
[0]: https://docs.npmjs.com/generating-provenance-statements
* bump Next in playground
* convert legacy Link after Next.js bump
* update yarn.lock
* switch to npm workspaces
* move `packages/playground-*` to `playgrounds/*`
* use `npm` instead of `yarn`
* sync package-lock.json
* use node 20 for insiders releases
* add scripts to help with automating releases
* add prepare-release and release workflows
* bump actions from v2 to v3
* use `github.ref_name` for getting the tag name
* ensure we use `**` for matching tags with slashes in them
Robin Malfait