Yeah you definitely don't need to install anything. I don't know how to deploy React apps apparently (will try to fix), but it's just a regular website and I would never ask users to expect anything else.
Update: it's because create-react-app creates manifest.json in public/, which causes Chrome to prompt you for this. I've deleted it in the latest container image and I'll redeploy once traffic dies down a bit.
Nope still there, but you may have caught the server at a bad moment. Because Asqi uses the DB read/write, there's only one replica of the server and it has less than 100% uptime depending on indexing and user load.