Apparently, essentially every one of our landing pages extending
portico.html had two copies of portico.css included in their head
section; one from porticocustomhead (or the super of customhead) and
the other directly included.
Clean this up by removing all these duplicate inclusions of the
portico stylesheet.
This creates a dropdown in place of the normal register/login links
you get when logged out, with an option to go to the app or log out if
that appears you click on the avatar.
A bit more work is needed to make this look really good, but it's a
great start.
This redesigns the /help/ page sets to be a single page app that uses
history.pushState to work the same as the old app.
The big new feature is that now we have the index in a nicely designed
left sidebar.