add hyprland init

modules/default.nix

@@ -3,6 +3,7 @@
     ./boot.nix
     ./home-manager.nix
     ./locale.nix
+    ./hyprland.nix
     ./networking.nix
     ./nix.nix
     ./packages.nix

modules/hyprland.nix

@@ -1,5 +1,7 @@
-{ pkgs, ... }: {
-  programs.hyprland.enable = true;
+{ inputs, pkgs, ... }: {
+  programs.hyprland = {
+    enable = true;
+  };
 
   services.xserver = {
     enable = true;

modules/nix.nix

@@ -1,5 +1,7 @@
 {
   nix.settings = {
-    experimental-features = "nix-command flakes";
+    experimental-features = "nix-command flakes";             # enable flakes
+    substituters = [ "https://hyprland.cachix.org" ];         # pre compiled hyprland packages
+    trusted-public-keys = [ "hyprland.cachix.org-1:a7pgxzMz7+chwVL3/pzj6jIBMioiJM7ypFP8PwtkuGc=" ];
   };
 }