[NixOS] Move xmonad config into its own module

nixos/xmonad.nix

@@ -0,0 +1,37 @@
+{ config, pkgs, options, inputs, ... }:
+{
+  nixpkgs.overlays = with inputs; [
+    xmonad.overlay
+    xmonad-contrib.overlay
+    notifications-tray-icon.overlay
+    (import ../dotfiles/config/xmonad/overlay.nix)
+  ] ++ taffybar.overlays;
+
+  services.xserver = {
+    windowManager = {
+      session = [
+        {
+          name = "xmonad";
+          start = ''
+            /usr/bin/env imalison-xmonad &
+            waitPID=$!
+          '';
+        }
+      ];
+    };
+  };
+
+  environment.systemPackages = with pkgs; [
+    # Haskell Desktop
+    haskellPackages.xmonad
+    haskellPackages.imalison-xmonad
+    haskellPackages.notifications-tray-icon
+    haskellPackages.gtk-sni-tray
+    haskellPackages.status-notifier-item
+    haskellPackages.dbus-hslogger
+  ];
+
+  home-manager.useGlobalPkgs = true;
+  home-manager.useUserPackages = true;
+  home-manager.users.imalison = (import ./home-manager.nix) inputs;
+}