add blueman and remove useless packages

configuration.nix

@@ -20,10 +20,6 @@
   ];
   nix.package = pkgs.lixPackageSets.stable.lix;
   nix.settings.trusted-users = [ "lucy" ];
-  nix.settings = {
-    substituters = [ "https://hyprland.cachix.org" ];
-    trusted-public-keys = [ "hyprland.cachix.org-1:a7pgxzMz7+chwVL3/pzj6jIBMioiJM7ypFP8PwtkuGc=" ];
-  };
   networking.hostName = "nixos"; # Define your hostname.
   networking.networkmanager.enable = true;
   networking.networkmanager.wifi.powersave = false;
@@ -61,7 +57,7 @@
   services.displayManager.ly.enable = true;
   powerManagement.powertop.enable = true;
   programs.hyprland = {
-    package = inputs.hyprland.packages.${pkgs.stdenv.hostPlatform.system}.hyprland;
+    package = pkgs.hyprland;
     enable = true;
     withUWSM = true; # recommended for most users
     xwayland.enable = true; # Xwayland can be disabled.
@@ -168,10 +164,6 @@
   nixpkgs.config.allowUnfree = true;
 
   environment.systemPackages = with pkgs; [
-    kdePackages.kcalc # Calculator
-    kdePackages.kclock # Clock app
-    kdePackages.sddm-kcm # SDDM configuration module
-    kdePackages.isoimagewriter # Write hybrid ISOs to USB
     wl-clipboard
     btop
     ripgrep
@@ -179,6 +171,7 @@
     bat
     grimblast
     git
+    blueman
   ];
   hardware.bluetooth = {
     enable = true;