Make sure you have Node & npm installed (npm is included with node). You can test by typing npm -v or node -v to see the version.
Open terminal.app on your mac. use cd to change directory into a folder. Use ls to list the directory. Example: cd Desktop then typing ls should show you your desktop contents. Another good command to know is mkdir NAME-OF-FOLDER-HERE to create a folder & rm -rf NAME-OF-FOLDER to delete a folder FOREVER. Terminal can be scary, but its powerful.
In top right of this page, click "Clone Or Download" and download the ZIP. or use Git if you know how, but thats for another day. Once it's downloaded to your "downloads" directory, run cd downloads/jaredandthemill.com to go into the directory.
In here, run npm install and wait for the things to install. Once that is done, you can open the direcotry in your favorite editor like Sublime or Atom. Then look below for available commands.
Development:
To get started developing, run npm start
To make a build, use npm run build. Then, go into /dist and open the index.html file to see your changes!
For deployment, use npm run publish and surge.sh will automagically publish it!