It's using Flutter to create web for GDG.
Kirin is an animal of imagination, combination of Dragon, Phoenix...
And Flutter also build Android, iOS, and Web(even if not support perfectly and just a dart)
The settings of anything in pubspec.yaml is not worked. If you want to use Material Icon from Google, it just work on Flutter Mobile, not work on Flutter Web, so you need the file of MaterialIcons-Regular.ttf.