You need to have Node.js installed first.
In the terminal install the needed packages:
$ npm install
For the moment being, you need to have the older version of npm 4.6.1
Check the nmp version
npm -v
If newer, downgrade it and run again the npm install command (erase the node_module folder)
sudo npm install -g npm@4.6.1
Run this to start the local server and then enter the url localhost:3000 in your browser to see the website:
$ gulp & php -S localhost:3000