Adds consensus color option to logos on website

This also modifies the downloads option and allows people to download
the SVG or PNG using the new alternative color scheme.
Moves toggle switches into settings dialog.

The proliferation of toggle switches was getting out of hand, so I
moved them into a settings dialog that can be opened or closed as
needed. This gets them out of the way most of the time allowing one to
focus on the logo.
Changes settings switches to radio buttons.

These can have labels and make it a lot easier to figure out which
option is active. Adding some help will make it even easier to
understand what each setting option is for.
Add help links to settings options and remove pop up colors

This change adds help links to all the settings options, so that people
can find out more about each of them. It also removes the colors from
the column info pop up if the consensus colors are in use as the other
colors don't make any sense in that context.
Adds help section to describe the consensus colors

A little table has been added to show what each of the colors in the
consensus color scheme represents.
Fixed font warning in Opera

I had to make the regex less specific as it was not matching the font
string in Opera and the warning message about not allowing fonts was
being displayed.
Added maintenance page for server down time
Merge branch 'consensus_colors'