Confusion between https://www.appimagehub.com and https://appimage.github.io/

Some AppImages on https://appimage.github.io/ seems to not be on https://www.appimagehub.com/ (I searched for ImHex), so I take it they are two different stores.
The documentation seems to refer to your store as "AppImageHub", and link to https://github.com/AppImage/AppImageHub , but it redirects to https://github.com/AppImage/appimage.github.io

My question is : What is https://www.appimagehub.com/ and how does it relate to https://appimage.github.io/ ?