similar to a hybrid of the random facts (but defined more simply) and
the dice rolling (but not picking from dice), this allows for definition
of "choice sets" (only in the admin for the moment) and then getting a
random pull from that set (only in the web interface for the moment)
for the moment this is for the password change url used in the auth
dropdown, and a better login page, but this might become other stuff
eventually too. the signup page exists and is linked to, even if i don't
have a great reason for this to exist
bunch of templates added now to support the intentional and
unintentional stuff
