Begin the move to the import all, activate by config model

modules/system/options/default.nix

@@ -0,0 +1,18 @@
+{ lib, ... }:
+with lib; {
+  options = {
+    system = {
+      desktop.enable = mkOption {
+        type = types.bool;
+        default = true;
+        description = "Enable desktop apps and services?";
+      };
+
+      server.enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Enable server services?";
+      };
+    };
+  };
+}