This is a web client for umu-launcher.
For now you need to build it from source.
Clone this repository somewhere on your disk. cd into protonhub.
Make sure you have go installed on your system.
Run go build -v for building process. And then run go install
This will install protonhub binary to $HOME/go/bin/ so you should have added this path to your $PATH env variable.
After installation you can open your localhost on port 8080 in your web browser.
From there you can create, edit or delete your games. Everything is running via Proton, via umu-launcher.
Make sure you have installed umu-launcher and have umu-run in your $PATH.