This switches us from the 'alpha' to 'beta' prerelease tag. After we
make our first deploy folks will be able to install the latest version
by doing `npm install @tldraw/tldraw@beta`.
### Change Type
- [x] `internal` — Any other changes that don't affect the published
package[^2]
[^1]: publishes a `patch` release, for devDependencies use `internal`
[^2]: will not publish a new version
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