Improve packaging (#328)

* Add gpgui-helper (#326)

* Add packaging

apps/gpgui-helper/src/pages/main.tsx

@@ -0,0 +1,6 @@
+import { createRoot } from "react-dom/client"
+import App from "../components/App/App";
+
+const rootApp = createRoot(document.getElementById('root') as HTMLElement);
+
+rootApp.render(<App />);