We use the variable "SANITY_REVALIDATE_SECRET" on the index page, but
the .env.local.example does not have this variable.
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## Bug
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## Feature
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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.
Fixes#14792Closes#14814
The project id is currently used by Sanity's image builder, which is used in a React component.
@maybac It was faster for me to create a new PR but the credit goes to you, thank you!.
[ch2502]
- Added new import flow to every CMS example, using the deploy button, and removed `vercel.json`
- Replaced `dotenv` with the new env support in outdated examples
