(/deploy-to-vercel) Add section about deploying a Vercel app to produ…

…ction (#1598)

Co-authored-by: victoria <[email protected]>

docs/deployments/deploy-to-vercel.mdx

@@ -33,3 +33,7 @@ If you already have a Vercel project for your application and need to integrate
 ## Vercel preview environment
 
 To configure Clerk within your Vercel preview environment, please see our guide for [configuring a preview environment](/docs/deployments/set-up-preview-environment).
+
+## Deploy to production
+
+If you would like to deploy your Vercel project to production, you will need to add your **production** API keys to your Vercel project. You will also need a domain that you own, as you cannot use a `*.vercel.app` domain for production. Refer to the [Deploy to production](/docs/deployments/overview) guide for more information.