reflect both app title and portal title in document title for named pages

[apetro]

In #679 a page like the /settings page ("Beta Settings") within a uPortal-app-framework application ("Frame App") within a portal ("uPortal"), would have a document title of Beta Settings | Frame App | uPortal.

This regressed with the removal of app-header, so now the /settings page reflects only the portal title and not the app title ( Beta Settings | uPortal).

I suspect the deeper namespacing is preferable for usability, putting the specific page in the context of its app; I suspect that if it is only going to reflect one or the other of app title or portal title, it should reflect the app title.