Dockerize Django run

[zhannaklimanova]

Create a simple Docker wrapper for running Django runserver so that the website can be deployed from a container instead of a virtual environment.

[dchiller]

We can borrow a lot of these configurations for Django and nginx from other dockerized websites we run (Cantus Ultimus, etc)

[ahankinson]

Please don't use runserver in any sort of "live" environment, including a deployed dev server. It's intended to be used locally only.