Proxy Backend via Frontend, use Express for Frontend
Currently, the Backend uses CORSMiddleware and just allow all origins with CORS-Headers is not secure. If the Backend was proxied by the Frontend, the CORS-Headers wouldn't have to be set. For Proxying the http-proxy-middleware
npm package could be used. Furthermore the backend port would not have to be exposed.
Also the current implementation of the frontend server is not very neat. With express we could just statically serve the entire pages
directory.