To build the website locally, you first need to install Jekyll. Then, you can launch in two terminal windows, from the repository folder, the following commands:
sass --watch docs/assets/sass/:docs/assets/css/to build the css style sheets, and,
jekyll serve --source docs/to start a Jekyll server.
You should now be able to access the website at the following address: http://127.0.0.1:4000.