Don't serve angular client from loopback server

[pulkitsinghal]

I would love it if our starter project also adopted a similar approach out-of-the-box:

https://github.com/TheDonDope/expensables/tree/develop/expensables-client#how-to-build-and-start-the-dockerized-version-of-the-application

expensables-angular - In development mode, this container serves the angular app. In production mode it builds the angular app, with the build artifacts being served by the Nginx container
expensables-nginx - This container is used only production mode. It serves the built angular app with Nginx.

cc @harshadyeola, @Bhushan001