Remove Xserver + xev.

nodes/hosts/common/services/xserver.nix

@@ -1,11 +0,0 @@
-{ pkgs, ...}: {
-  # Enable the X11 windowing system.
-  # You can disable this if you're only using the Wayland session.
-  services.xserver = {
-    enable = true;
-    xkb = {
-      layout = "us";
-      variant = "";
-    };
-  };
-}