## Feature
- [x] Documentation added
## Documentation / Examples
- [x] The examples guidelines are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples)
This PR updates the cms-sanity example to:
- Deploy to Vercel with the [Sanity Vercel Integration](https://www.sanity.io/docs/vercel-integration) by default.
- You can still opt-out of using the Sanity Vercel Integration, clicking `You can also set up manually` gives you all the information you need.
- The blog itself is updated so it's much more resilient to missing data, and is setup to set `revalidate: 60` until you have a On-demand Revalidation webhook setup.
- Preview Mode is now enabled on the frontpage as well.
- The Sanity client setup, and webhook validation, are updated to follow our current best practices.
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