node-red address should be configurable

[hipitihop]

Other then this recent change by @philipp2310 which corrected the socket error when the UI starts up, there is still a remaining error shown in the devtools network panel:

To reproduce:

• open the devtools in Chrome and switch to the network tab
• refresh Alice Web UI

This looks like it is the http port for node-red UI and this should probably be a configuration option along with templates so that the correct IP address is used (note in my case I'm running in a container and the browser won't have access to it on the container address 172.22.0.3:1880)

Running on 1.0.0-b5