Add tox node public key to the readme

src/freedombone

   configure_firewall_for_tox
 
   if ! grep -q "Tox node" /home/$MY_USERNAME/README; then
-      XMPP_PASSWORD="$(openssl rand -base64 8)"
-      prosodyctl register $MY_USERNAME $DEFAULT_DOMAIN_NAME $XMPP_PASSWORD
       echo '' >> /home/$MY_USERNAME/README
       echo '' >> /home/$MY_USERNAME/README
       echo 'Tox' >> /home/$MY_USERNAME/README