* 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