[Tech] (?) Let's update the website

[Stephane Bortzmeyer]

On Thu, Apr 01, 2021 at 09:55:15AM +0200,
 Johann Galle <johann at qwertqwefsday.eu> wrote 
 a message of 164 lines which said:

> A problem that I had raised to Solderpunk before multiple times is
> that the specification and everything else in the repository is not
> licensed, which is at least a grey area in this case.

Reported in the specification work issue tracker
<https://gitlab.com/gemini-specification/protocol/-/issues/22>.