Setup a PostgreSQL database for the website

[bazadactyl]

When I initially set up Django (#5), I deferred the database setup and chose the default SQLite. Since SQLite is too lite for what we want to do in our database, we want to have Postgres. As an example, I'd like to use database triggers and a nice web interface like pgadmin, among other features not offered by SQLite.

This task will be deemed resolved when the following tasks are completed:

• move from SQLite to Postgres in our Django project
• figure out how to set up the Postgres on our server