WIP(Experimental): Next.js Support

[JakePartusch]

This PR utilizes an alpha construct from serverless-next, so it is not quite ready for primetime, but can possibly publish under an experimental flag. https://github.com/serverless-nextjs/serverless-next.js/tree/master/packages/serverless-components/nextjs-cdk-construct

• [ ] Add SSR to example application
• [ ] Add ISR to example application
• [ ] Fix bug were Next.js construct cannot be deploy outside of us-east-1 region
• [ ] Update documentation
• [ ] Publish under beta or experimental flag (eg. __experimental_nextjs)
• [ ] Remove hard dependencies on Next.js and React

[github-actions[bot]]

✅ Your deploy preview is ready: https://06e713e7.serverlessui.app