Add demo to sign-in page

Add a small, 5-story demo to the first
page people will often see.

Removed the older 'demo mode' html, as
it is quickly becoming unnecessary.
Sign In: Add 'sign up' form

Add a simple form for signing up for
an account on the server. Does not do
anything with the server yet.
Waitlist: Add requests to database

Make an admin/waitlist view in our
database, and add waitlist requests
to that.
Waitlist: Show requests on mainframe page