docs: add documentation for new deploy input

Author: dphang

README.md

@@ -430,6 +430,7 @@ The fourth cache behaviour handles next API requests `api/*`.
 | useServerlessTraceTarget | `boolean`         | `false`                                                                                                                    | Use the experimental-serverless-trace target to build your next app. This is the same build target that Vercel Now uses. See this [RFC](https://github.com/vercel/next.js/pull/8246) for details.                                                                                                                                                                                |
 | logLambdaExecutionTimes  | `boolean`         | `false`                                                                                                                    | Logs to CloudWatch the default handler performance metrics.                                                                                                                                                                                                                                                                                                                      |
 | minifyHandlers           | `boolean`         | `false`                                                                                                                    | Use minified handlers to reduce code size.                                                                                                                                                                                                                                                                                                                                       |
+| deploy                   | `boolean`         | `true`                                                                                                                     | Whether to deploy resources to AWS. Useful if you just need the Lambdas and assets but want to deploy them yourself (available in latest alpha).                                                                                                                                                                                                                                 |
 
 Custom inputs can be configured like this: