Adapt the the CSS to use the console style and match highlight colours AGPUSH-712

This is alternative proposal for UPS Account Management customization, that

* reuses style of UPS Console
* avoids code duplication
* brings correcet favicons

I'm opening this pull request for a discussion, further modifications might be needed.

Customization of Keycloak's account view template was necessary, but it is unavoidable anyway since Keycloak does not allow to modify e.g. titles or Back button (this is subject to be resolved in upstream).

https://issues.jboss.org/browse/AGPUSH-725