Updated Flutter for iOS Landing Page

[sethladd]

What information needs to be added?

Tracking issue. There's a Google Doc with a critique and assessment we can use to help update this page. (I am omitting the link to the Google Doc as I don't know our policy about linking to internal @google.com Google Docs)

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.