Include machine specific config if existent

lib/system.nix

@@ -3,14 +3,16 @@
         { dualBoot ? false } :
             let
                 lib = nixpkgs.lib;
+                configPath = ./machines/${name}.nix;
             in
                 lib.nixosSystem {
                     system = "x86_64-linux";
                     modules = [
                         (
                             { config, pkgs, ... }: {
-                                imports = [
-                                    ../hardware-configuration.nix
+                                imports = lib.concatLists [
+                                    (lib.optional (builtins.pathExists configPath) configPath)
+                                    []
                                 ];
                             })
                     ];