Set IPs and Ports for dev/production web app

[DickChesterwood]

Usually, we avoid any references to IP addresses and ports anywhere in the code.

The exception is for the webapp, which as far as I can tell has no way of magically working out the IP/Domain and Port of the API gateway. Remember the webapp is Angular and therefore 100% client side.

The way I'm implementing this is: (there may be a better way, will learn about this over time)

1. Angular client will get the IP address/domain of where it was served from (simple Javascript)
2. We will standardise on port 8080 in production, and port 30000 for local-microservice.

This keeps things simple.

(there must be a better way!)

[DickChesterwood]

I think this is there now, although I used 30040 for the front end due to 30000 not being available.