docs: add Layer0 deployment guide

[rishi-raj-jain]

Layer0 is an all-in-one platform to develop, deploy, preview, experiment on, monitor, and run your headless frontend. It is focused on large, dynamic websites and best-in-class performance through EdgeJS (a JavaScript-based Content Delivery Network), predictive prefetching, and performance monitoring. Layer0 offers a free tier.

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/jared/razzle/BHFkvYZb6Yq9rwqtuaPASjWcWE1F
✅ Preview: https://razzle-git-fork-rishi-raj-jain-patch-1-jared.vercel.app

[fivethreeo]

This has no razzle related deployment instructions

[rishi-raj-jain]

@fivethreeo the Layer0 CLI automatically detects if the project is razzle, and adds all the required things to get it deploying right away.

Alternative quick guide could be:

"
Layer0 is an all-in-one platform to develop, deploy, preview, experiment on, monitor, and run your headless frontend. It is focused on large, dynamic websites and best-in-class performance through EdgeJS (a JavaScript-based Content Delivery Network), predictive prefetching, and performance monitoring. Layer0 offers a free tier. Get started in just a few minutes by following Layer0's guide to deploying Razzle.
"