This prototype is a static HTML/JS/CSS website. There is no server-side code to run, and later production versions are not intended to have any server-side code either.
For the map libraries to operate correctly though, it needs to be run from a HTTP/HTTPS location. i.e. not file:// on your PC. That means you will need to run a local server for viewing/development.
On a Mac OS X or Linux operating system, you can start a suitable local server at http://localhost:8000 like so:
cd /path/to/the/code
python -m SimpleHTTPServer 8000
For a Windows solution, you may wish to consider using Mongoose or another web server.
In production, obviously you would want to use Nginx, Apache or another production-grade web server.