Improve Ubuntu config

configs/home-gui.nix

@@ -1,31 +0,0 @@
-{ config, lib, pkgs, ... }:
-{
-
-  nixpkgs.config.packageOverrides = pkgs: {
-    nur = import (builtins.fetchTarball "https://github.com/nix-community/NUR/archive/master.tar.gz") {
-      inherit pkgs;
-    };
-  };
-  home.packages = with pkgs; [
-    keepassxc
-    krita
-    element-desktop
-    mpv
-    mumble
-    libreoffice-fresh
-    slack
-    thunderbird
-    zoom-us
-  ];
-  programs.firefox = {
-    enable = true;
-    extensions = with pkgs.nur.repos.rycee.firefox-addons; [
-      keepassxc-browser
-      ublock-origin
-      umatrix
-      cookie-autodelete
-    ];
-  };
-
-  services.nextcloud-client.enable = true;
-}