Add a html-version of EULA
We decided that it would be nice to have an HTML version of our EULA in our last session.
In reForis, we now are parsing a plain-text EULA from here.
Or maybe we can just create it on our website (turris.com/sentinel) and refer to it? For instance, I found an older version on Project Turris.
cc: @vmyslivec, @mprudek, @kkoci