styles：变更目录更具可读性

lib/routers/router_handler.dart

@@ -4,7 +4,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_picgo/views/app_page/app_page.dart';
 import 'package:flutter_picgo/views/album_page/album_page.dart';
 import 'package:flutter_picgo/views/pb_setting_page/pb_setting_page.dart';
-import 'package:flutter_picgo/views/pb_setting_page/github_page.dart';
+import 'package:flutter_picgo/views/pb_setting_page/github_page/github_page.dart';
 import 'package:flutter_picgo/views/picgo_setting_page/picgo_setting_page.dart';
 import 'package:flutter_picgo/views/setting_page/setting_page.dart';
 import 'package:flutter_picgo/views/404.dart';

pubspec.yaml

@@ -53,7 +53,7 @@ flutter:
 
   # To add assets to your application, add an assets section, like this:
   assets:
-    - images/logo.png
+    - assets/images/logo.png
   #   - images/a_dot_ham.jpeg
 
   # An image asset can refer to one or more resolution-specific "variants", see
@@ -70,7 +70,7 @@ flutter:
   fonts:
     - family: Iconfont
       fonts:
-         - asset: fonts/iconfont.ttf
+         - asset: assets/fonts/iconfont.ttf
   #       - asset: fonts/Schyler-Italic.ttf
   #         style: italic
   #   - family: Trajan Pro