Help surface layout widgets for multiple different design languages

[sethladd]

What information needs to be added?

A quick look at this page (https://docs.flutter.dev/ui/widgets/layout) seems to show that it is largely design language independent layout options. (modulo Carousel, which is from the Material library)

If there are Cupertino-specific layout widgets/options, we should consider:

• Adding a Cupertino Layout catalog somewhere on the site
• Adding a Material Layout catalog somewhere on the site
• Making https://docs.flutter.dev/ui/widgets/layout clear that it is design language independent layout options
• Cross link all these catalogs (if you are looking at generic layout options, you can learn that there are other layout options over in other design language catalogs)

Where should this new content appear?

No response

I would like to fix this problem.

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