Here is sigma.js' website. The master branch presents the resources to build the website, and the gh-pages branch contains the built files.
The website has been designed by Daniele, who also implemented it with the help of Alexis.
The website is based on Assemble. Be sure to have NPM and Grunt installed before continuing.
First clone the repository:
git clone git@github.com:jacomyal/sigmajs.org
cd sigmajs.org
Then, install the dependencies:
npm install
Finally, run the Grunt tasks:
grunt
At this point, the built website is available in the dist repository, with pages and built assets. Then, you just need to copy the dist folder content to the root of the gh-pages branch.