Serve React via static folder in Django

# Overview

As part of the deployment and actions added by @themightychris we want to build our React bundle and deliver it as static files via our Django container.

# Context

We _could_ leave the frontend to be delivered as a separate container, but it would require many more resources on Code for Philly's part and on the user's part. Serving this all from one container will be much better for everyone in the long run.

# Suggested solution (optional)

This [blog post](https://medium.com/codex/deploying-react-through-djangos-static-files-part-1-dev-setup-8a3a7b93c809) shows a good way to move forward with this, starting at the "Configuring Django and static files" section since we already have our front and back ends built