Make home-manager config for ll-latitude-e5591 build again

nixos/features/i3wm.nix

@@ -0,0 +1,32 @@
+{ pkgs, ... }: {
+  services.xserver = {
+    enable = true;
+
+    desktopManager = {
+      xterm.enable = false;
+      gnome.enable = true;
+    };
+
+    windowManager = {
+      i3.enable = true;
+    };
+
+    displayManager.lightdm.enable = true;
+  };
+
+  services.displayManager.defaultSession = "none+i3";
+
+  systemd.user.services.polkit-gnome-authentication-agent-1 = {
+    description = "polkit-gnome-authentication-agent-1";
+    wantedBy = [ "graphical-session.target" ];
+    wants = [ "graphical-session.target" ];
+    after = [ "graphical-session.target" ];
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = "${pkgs.polkit_gnome}/libexec/polkit-gnome-authentication-agent-1";
+      Restart = "on-failure";
+      RestartSec = 1;
+      TimeoutStopSec = 10;
+    };
+  };
+}