Parametrize all environment variables correctly

[esune]

Some of the parameters used by the deployed web applications are currently not parametrized correctly (see #45). We should be instead using configurations that can be injected at runtime.

Consider using the config map currently holding the keycloak config to add new parameters, and store the configuration in the state service (or similar) after the application has started.

[swcurran]

@esune - Can we close this? If so, please do.

[esune]

Still a WIP, we have been waiting to get to a more "stable" release in order to implement the proper strategy.

[esune]

I think this can be closed now, current work is building on top of the new configurations already.