Docs updated or added since the 3.0 release

The navigation and routing overview page has been
rewritten with more guidance on using Navigator
and Router together, named routes, and
using a routing package.

The URL strategies page has also been updated
to reflect a more streamlined API.

For apps not published to the Microsoft Store, you
can now set the app’s executable’s file and
product versions in the pubspec file.
For more information, see
Build and release a Windows desktop app.

If you are developing software for iOS 16 and higher, 
you must enable Developer mode.
The macOS install page is updated
with this information.

As described in the 3.3 release notes,
you should catch all errors and exceptions 
in your app by setting
the PlatformDispatcher.onError callback,
instead of using a custom Zone.
The Handling errors in Flutter
page has been updated with this advice.