- [x] explicitly show what "good to go, everything is green!" looks like, after `flutter doctor` - [x] explicitly tell the developer what to do when `flutter doctor` fails for some reason (e.g. email our mailing list or open a bug with the output) - [x] include a link to "how to install Atom" at bottom of Setup - [x] add Next Steps at end of Setup, pointing to Getting Started - [x] link to Setup from Homepage, under Getting Started - [x] iOS screenshot on Getting Started needs to show Slow Mode banner thanks!