Cupertino widget catalog is missing images

[johnpryan]

Page URL

https://docs.flutter.dev/ui/widgets/cupertino

Page source

No response

Describe the problem

The Widget catalog is missing images, which makes some of the images appear as a Flutter logo with a red striped background:

Expected fix

We should add missing images and move widgets without a visual component to a separate section (maybe at the bottom of the page?)

Additional context

No response

I would like to fix this problem.

• [x] I will try and fix this problem on docs.flutter.dev.