hosts/astatine,hosts/beryllium,hosts/tungsten: Migrate to

systemd-networkd

Policy routing clashed with the fallback dhcp on any interface module
for some unknown reason, therefore wg-clerie is disabled on all of these
devices

profiles/default.nix

@@ -8,6 +8,7 @@
     ./hetzner-cloud
     ./mercury-vm
     ./netcup
+    ./network-fallback-dhcp
   ];
 
 }