docs: remove css tags

docs/zh/guide.md

@@ -68,7 +68,6 @@ yarn add dplayer
 加载播放器文件:
 
 ```html
-<link rel="stylesheet" href="DPlayer.min.css" />
 <div id="dplayer"></div>
 <script src="DPlayer.min.js"></script>
 ```
@@ -76,7 +75,6 @@ yarn add dplayer
 或者使用模块管理器:
 
 ```js
-import 'dplayer/dist/DPlayer.min.css';
 import DPlayer from 'dplayer';
 
 const dp = new DPlayer(options);