Refactoring the config

modules/common/default.nix

@@ -0,0 +1,45 @@
+{ nixpkgs-unstable, ... }:
+
+{
+  imports =
+    [
+      ./packages.nix
+      ./system.nix
+    ];
+
+  # Import local packages
+  nixpkgs.overlays = [
+    (final: prev: {
+      local = import ../../pkgs { pkgs = final; };
+    })
+
+    # Unstable
+    (final: prev: {
+      unstable = import nixpkgs-unstable {
+        system = prev.system;
+      };
+    })
+  ];
+
+  nixpkgs.config.allowUnfree = true;
+
+  nix.extraOptions = ''
+    experimental-features = nix-command flakes
+  '';
+
+  nix.optimise.automatic = true;
+
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 30d";
+  };
+
+  # 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
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "22.11"; # Did you read the comment?
+}