## 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.
[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- Replaced `dotenv` with the new env support in outdated examples
* Add start of Sanity CMS example
* Update cover-image
* Clean up example
* Apply suggestions from code review
Co-Authored-By: Shu Uesugi <shu@chibicode.com>
* Make changes from review
* Remove extra style
* Apply suggestions from code review
Co-Authored-By: Shu Uesugi <shu@chibicode.com>
* Make tweaks for preview mode and normalize env naming
* Update viewing preview step
* Delete author.jpg
* Delete image.jpg
* Update README
* Fix environment variable names
* Project ID is needed by lambda
* Improved steps
* Fixed issue with the project URL example
* Clarify line
* Get the preview post correctly
* preview = false
* Get unique posts
* Show preview mode on index page
* typo fix and use next latest
* Added related examples section
Co-authored-by: Shu Uesugi <shu@chibicode.com>
Co-authored-by: Luis Alvarez <luis@zeit.co>
