This PR removes the skeleton Embeds page.
While we're here, do we also want to remove the skeleton Persistence
page (would it fit somewhere else? or nah?)
### Change Type
- [x] `documentation` — Changes to the documentation only[^2]
[^1]: publishes a `patch` release, for devDependencies use `internal`
[^2]: will not publish a new version
### Test Plan
1. On the docs site...
2. Make sure that there's no 'Embeds' page in the menu.
- [ ] Unit Tests
- [ ] End to end tests
### Release Notes
- Documentation: Removed unused Embeds page.