Publish the website on Github pages

[xavierfoucrier]

Since the official domain has been owned by someone else, we will publish the site using Github pages.
There is some stuff to do before publishing a solid release:

• upgrade dependencies
• switch to another react version

[Sandstedt]

I have started a new branch called rebuild, but it's not ready yet.

[xavierfoucrier]

Perfect 😉