design: Sort settings routes

lib/pages/settings_chat.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/material.dart';
+
+import 'views/settings_chat_view.dart';
+
+class SettingsChat extends StatefulWidget {
+  const SettingsChat({Key key}) : super(key: key);
+
+  @override
+  SettingsChatController createState() => SettingsChatController();
+}
+
+class SettingsChatController extends State<SettingsChat> {
+  @override
+  Widget build(BuildContext context) => SettingsChatView(this);
+}