Major config overhaul: use custom modules, setup for multi-host config, and less boilerplate

modules/user/office/default.nix

@@ -0,0 +1,33 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.userSettings.office;
+in {
+  options = {
+    userSettings.office = {
+      enable = lib.mkEnableOption "Enable my office programs";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    home.packages = with pkgs; [
+      shared-mime-info
+      nautilus
+      libreoffice-still
+      mate.atril
+      xournalpp
+      adwaita-icon-theme
+      newsflash
+      foliate
+      gnome-maps
+      seahorse
+      element-desktop
+      openvpn
+    ];
+    services.syncthing.enable = true;
+    services.nextcloud-client = {
+      enable = true;
+      startInBackground = true;
+    };
+  };
+}