I created a new theme, "TheMotte" in /assests/css. Someone with any design
skill at all should try improving this. Currently it is a copy of light.css
__main__.py defines the experience for a user without an account. I removed the
check for an OS environment variable, and defaulted to the new theme.
/classes/user.py defines the default for a new account. I removed the check for an OS
environment variable, and defaulted to the new theme.
/routes/settings.py has a list of the themes that checks them for... something.
I added the new one here, just in case.
/templates/settings_profile.html has a hardcoded list that controls which
themes appear in the user settings page. Added the new theme here, so you can
select it.
