Hardening Qubes-Whonix

Another point to add… Due to https://forums.whonix.org/t/disable-sys-net-pings-to-fedoraproject-org switch your sys-net and sys-firewall to Debian, if that works for you. [medium difficulty since this can break your networking. I advice to keep the original sys-net and sys-firewall Fedora based. Just in case. So you can switch back. And have a separate sys-net-debian as well as sys-firewall-debian.]