The first time, get all the dependencies loaded via
npm install
Then, run the server via
npm run site-dev-server
Open http://localhost:8080/
Anytime you change the contents, just refresh the page and it's going to be updated.
Just run the publish script, this will setup your environment if it's not already then it'll automatically build a static version of the site and publish it to gh-pages.
npm run site-publish