fix: typo

Author: lucifer

introduction.md

@@ -13,7 +13,6 @@
 [![](https://img.shields.io/badge/Zhihu-知乎-blue)](https://www.zhihu.com/people/lu-xiao-13-70)
 [![](https://img.shields.io/badge/bilili-哔哩哔哩-ff69b4)](https://space.bilibili.com/519510412/)
 
-简体中文 | [English](./README.en.md)
 简体中文 | [English](./README.en.md)
 
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