add nix settings

hosts/default/configuration.nix

@@ -22,13 +22,6 @@
     xwayland.enable = true;
   };
 
-  # Enable dconf
-  programs.dconf.enable = true;
-  # Enable CUPS to print documents.
-  services.printing.enable = true;
-
-  programs.zsh.enable = true;
-
   nix.settings.trusted-users = ["root" "user"];
 
   # Define a user account. Don't forget to set a password with ‘passwd’.
@@ -83,20 +76,6 @@
     };
   };
 
-  # Allow unfree packages
-  nixpkgs.config = {
-    allowUnfree = true;
-
-    packageOverrides = pkgs: {
-      vaapiIntel = pkgs.vaapiIntel.override {enableHybridCodec = true;};
-    };
-  };
-
-  # Nix extra options
-  nix.extraOptions = ''
-    experimental-features = nix-command flakes
-  '';
-
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions
   # on your system were taken. It‘s perfectly fine and recommended to leave

modules/nixos/default.nix

@@ -15,4 +15,30 @@
     ./ssh
     ./virtualisation
   ];
+
+  nix = {
+    settings = {
+      experimental-features = ["nix-command" "flakes"];
+      auto-optimise-store = true;
+    };
+    gc = {
+      automatic = true;
+      dates = "daily";
+      options = "--delete-older-than 15d";
+    };
+  };
+
+  nixpkgs.config.allowUnfree = true;
+
+  services = {
+    gvfs.enable = true;
+    printing.enable = true;
+    upower.enable = true;
+    uptimed.enable = true;
+  };
+
+  programs = {
+    dconf.enable = true;
+    zsh.enable = true;
+  };
 }