Volume for config for web container

[mekane]

It occurred to me that it will matter a great deal what files are in the config directory per environment. So we want to be able to change those. So rather than baking the 'config' directory into the images we should share those via a volume.

Ideally, if we can bake in the directory with the default files and override just local and secure.json that would be best.

[mekane]

Looking through the config, we are reasonably confident that the web app doesn't care about much in config. It looks at the window location to figure out the middleware url and there is very little else in there that would even pertain to the web app. So we are going to proceed as is and see if anything comes up during testing.