refactor(scaffold): 更新布局方式

lib/news.dart

@@ -1,17 +1,10 @@
 import 'package:flutter/material.dart';
 
-import 'layout/layout_scaffold.dart';
-
 class News extends StatelessWidget {
   const News({Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
-    return LayoutScaffold(
-      appBar: AppBar(
-        title: const Text('道听'),
-      ),
-      body: null,
-    );
+    return Container();
   }
 }