Provide support for running app in docker container.

[circlle]

For people who prefer Docker to global installs, they can start quickly by using docker-compose. This PR add two files, Dockerfile and docker-compose.yml. Some guide steps have also been added to the README.md as well.

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[leerob]

It's now using standard Next.js, which means the standard Next.js docker file examples will work!

https://github.com/vercel/server-components-notes-demo/pull/33