Revert "nixos/none: remove"

nixos/modules/module-list.nix

@@ -907,6 +907,7 @@
   ./services/x11/window-managers/icewm.nix
   ./services/x11/window-managers/bspwm.nix
   ./services/x11/window-managers/metacity.nix
+  ./services/x11/window-managers/none.nix
   ./services/x11/window-managers/twm.nix
   ./services/x11/window-managers/windowlab.nix
   ./services/x11/window-managers/wmii.nix

nixos/modules/services/x11/desktop-managers/default.nix

@@ -18,7 +18,7 @@ in
   # determines the default: later modules (if enabled) are preferred.
   # E.g., if Plasma 5 is enabled, it supersedes xterm.
   imports = [
-    ./xterm.nix ./xfce.nix ./plasma5.nix ./lumina.nix
+    ./none.nix ./xterm.nix ./xfce.nix ./plasma5.nix ./lumina.nix
     ./lxqt.nix ./enlightenment.nix ./gnome3.nix ./kodi.nix ./maxx.nix
     ./mate.nix ./pantheon.nix ./surf-display.nix ./cde.nix
   ];

nixos/modules/services/x11/desktop-managers/none.nix

@@ -0,0 +1,7 @@
+{
+  services.xserver.desktopManager.session =
+    [ { name = "none";
+        start = "";
+      }
+    ];
+}

nixos/modules/services/x11/window-managers/default.nix

@@ -35,7 +35,7 @@ in
     ./wmii.nix
     ./xmonad.nix
     ./qtile.nix
-  ];
+    ./none.nix ];
 
   options = {
 

nixos/modules/services/x11/window-managers/none.nix

@@ -0,0 +1,12 @@
+{
+  services = {
+    xserver = {
+      windowManager = {
+        session = [{
+          name = "none";
+          start = "";
+        }];
+      };
+    };
+  };
+}