update nixos config, update install-new-desktop.sh

nixos/surface-extra-hardware-configuration.nix

@@ -0,0 +1,32 @@
+# This is a custom file for a surface.
+
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  # Set an usable key configuration: Ctrl at capslock, Win at Alt, Alt at Ctrl
+  services.xserver.displayManager.sessionCommands =''
+    ${pkgs.xorg.xmodmap}/bin/xmodmap "${pkgs.writeText  "xkb-layout" ''
+      !
+      ! Swap Caps_Lock and Control_L
+      !
+      
+	remove Lock = Caps_Lock
+	remove Control = Control_L
+	! keysym Control_L = Caps_Lock
+	keysym Control_L = Mode_switch
+	keysym Caps_Lock = Control_L
+	add Lock = Caps_Lock
+	add Control = Control_L
+
+	! map arrows to more ergonomic position
+	keycode  43 = h H Left
+	keycode  44 = j J Down
+	keycode  45 = k K Up 
+	keycode  46 = l L Right 
+    ''}"
+  '';
+
+
+  # add pulseaudio support to manage audio
+  hardware.pulseaudio.enable = true;
+}