Simplifying Navigator 2.0 with GoRouter

Now that we have gotten familiar with how to use GoRouter we can begin to refactor the Hacker News application to take advantage of its features. First, we need to swap out our demo routes with the actual routes to our application. Inside of app_router.dart replace GoRouter.routes with the following:

GoRoute(
      path: '/',
      redirect: (_) =>
        '/stories/${StoriesType.newStories.name}',
    ),
    GoRoute(
      path: '/stories/:storyType',
      builder: (context, state) {
        final storyTypeName =
            state.params['storyType'] ?? 
        ...