Some additional tweaks for Logos and Icons in the core settings

[nathank (Nathan Kershaw)]

Thanks Hugh!

I’ve just noticed that my second suggestion seems to be already implemented (or I got confused when posting above):

@nathank

Alternatively, we could have the Manifest icon used to generate the Android home screen icon (instead of Square Icon)

Certainly, when I just tested installing our PWA on Android, it surprised me by using the Manifest icon.