change default images

[IObert]

The default images are now consumable publicly (as discussed last week)

I didn't change the content of the readme files as this would probably require a larger rework of the content, scripts and GitHub actions.

[qmacro]

Thanks @IObert - will check this out tomorrow.

[IObert]

I just came across this today and it seems both of us forgot this 😄 @qmacro