move config to modules

config/i3.nix

@@ -0,0 +1,22 @@
+{ config, pkgs, ... }:
+{
+imports = [
+  ./xorg.nix
+];
+services.xserver.windowManager.i3.enable = true;
+
+environment.systemPackages = with pkgs; [
+  # might use picom as a compositor
+  lightdm-slick-greeter
+  rofi
+  i3status
+  i3lock
+  xfce.xfce4-power-manager
+  networkmanager
+  networkmanagerapplet
+  networkmanager-openvpn
+  networkmanager-openconnect
+  libnotify
+  dunst
+];
+}