Finish modularising config

There are still some things I want to change, but at least there aren't two systems now.

modules/ugent/citrix.nix

@@ -0,0 +1,20 @@
+{ config, lib, ... }:
+
+{
+  options.chvp.ugent.citrix.enable = lib.mkOption {
+    default = false;
+    example = true;
+  };
+
+  config = lib.mkIf config.chvp.ugent.citrix.enable {
+    chvp = {
+      nix.unfreePackages = [ "citrix-workspace" ];
+      zfs.homeLinks = [
+        { path = ".ICAClient"; type = "data"; }
+      ];
+    };
+    home-manager.users.charlotte = { pkgs, ... }: {
+      home.packages = with pkgs; [ citrix_workspace ];
+    };
+  };
+}