[buildpack] Support running static front-end apps

Feature Request

It would be great for Oryx / Oryx Buildpacks to support building and running static front-end apps like React.

Current behavior

For static-front end apps like a React application, the app is currently treated as-if it's a general NodeJS application, with the following described behavior:

1. For build, npm run build (correct for React)
2. For run, npm run start. (not expected).

What can be done?

npm run build produced a bundled HTML/JS file content ready to be served by any web server. The image should contain a lightweight web server such as nginx to serve the static file content, and the run command is slightly to start the web server to serve the static files. An reference implementation can be found in paketo web-servers.