Remaps Alt_l arrow keys using hjkl

hosts/citadel/default.nix

@@ -79,6 +79,16 @@ in
     };
   };
 
+  # Remap Alt_L +[hjkl] to left down up right
+  services.xserver.displayManager.sessionCommands =
+    "${pkgs.xorg.xmodmap}/bin/xmodmap ${pkgs.writeText  "xkb-layout" ''
+      keycode 64 = Mode_switch
+      keycode 43 = h H Left H
+      keycode 44 = j J Down J
+      keycode 45 = k K Up K
+      keycode 46 = l L Right L
+  ''}";
+
   hardware = {
     bluetooth = {
       enable = true;