Banner html is now in banner_tag.html
The html has the first banner set, so that if javascript is disabled a banner
is still visible and clickable.

The title/description for a generic banner is set as the document name, but
the coded views are hardcoded with 'title': 'Title of Page'. So these will
not easily be changeable by site admins. I could also just not show generic
views for them. (If a title is not given, or 'show_generic' is not given as
True, then no generic banner is shown.)