First, ensure that you have all the dependencies installed on your system. It's a good idea to run this each time you pull to make sure your dependencies are up-to-date.
bundle install
This site is built on top of Middleman. There are two ways to run the site in development:
bundle exec middleman server
Once that boots up, the website will be available at http://0.0.0.0:4567.
Setup and access the site via pow as you would any other Rack application. Caveat: When using Pow, if you notice new assets aren't available, you may need to restart the site as per the usual touch tmp/restart.txt.