Began the process of removing all invalid role attributes starting with the header, login, and notifications components. Updated the corresponding scripts as well.
Made a few structural changes to the header to simply it and then tested it to ensure notification still worked.
Rebuilt the css for the Settings UI, which also led to some changed in
the FilesAPI so it knows what to do with specific targets. There's still
some additional styling needed to polish it, but the core structure is
in place so now it can just be tweaked. The controller for this page was
adjusted as needed.
Also moved the settings sub nav convtrols to the header menu since it's
sticky now.
