Refactor configs

hosts/mail/default.nix

@@ -1,12 +1,16 @@
-{ config, lib, pkgs, inputs, ... }:
+{ config, lib, self, ... }:
 
 {
   imports = [
+    self.inputs.disko.nixosModules.disko
+    self.inputs.nixos-mailserver.nixosModule
     ./hardware-configuration.nix
     ./disko-config.nix
     ../server.nix
   ];
 
+  nixpkgs.hostPlatform = "x86_64-linux";
+
   networking = {
     hostId = "08ac2f14";
     domain = "mesh.vimium.net";