Hydra: disable firewall

Firewalls are only for poorly configured systems running insecure
services.

hosts/hydra/configuration.nix

@@ -76,6 +76,7 @@
   };
 
   networking.hostName = "hydra";
+  networking.firewall.enable = false;
 
   networking.useHostResolvConf = true;
 

hosts/hydra/hydra.nix

@@ -40,6 +40,4 @@
       };
     };
   };
-
-  networking.firewall.allowedTCPPorts = [ 80 443 ];
 }