Update docs

README-zh.md

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-[English](README.md) | [中文](README-zh.md) | [Libro en Español](https://books2read.com/vpnguidees?store=amazon)
+[English](README.md) | [中文](README-zh.md)
 
 # Docker 上的 IPsec VPN 服务器
 
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 IPsec VPN 可以加密你的网络流量，以防止在通过因特网传送时，你和 VPN 服务器之间的任何人对你的数据的未经授权的访问。在使用不安全的网络时，这是特别有用的，例如在咖啡厅，机场或旅馆房间。
 
-**[» :book: Book: 搭建自己的 VPN 服务器分步指南](https://books2read.com/vpnguidezh)**
+**[» :book: Book: 搭建自己的 VPN 服务器分步指南](https://books2read.com/vpnguidezh)** [[中文](https://books2read.com/vpnguidezh) | [English](https://books2read.com/vpnguide?store=amazon) | [Español](https://books2read.com/vpnguidees?store=amazon) | [Deutsch](https://books2read.com/vpnguidede?store=amazon) | [Français](https://books2read.com/vpnguidefr?store=amazon)]
 
 ## 快速开始
 

README.md

@@ -1,4 +1,4 @@
-[English](README.md) | [中文](README-zh.md) | [Libro en Español](https://books2read.com/vpnguidees?store=amazon)
+[English](README.md) | [中文](README-zh.md)
 
 # IPsec VPN Server on Docker
 
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 An IPsec VPN encrypts your network traffic, so that nobody between you and the VPN server can eavesdrop on your data as it travels via the Internet. This is especially useful when using unsecured networks, e.g. at coffee shops, airports or hotel rooms.
 
-**[» :book: Book: Build Your Own VPN Server: A Step by Step Guide](https://books2read.com/vpnguide?store=amazon)**
+**[» :book: Book: Build Your Own VPN Server](https://books2read.com/vpnguide?store=amazon)** [[English](https://books2read.com/vpnguide?store=amazon) | [中文](https://books2read.com/vpnguidezh) | [Español](https://books2read.com/vpnguidees?store=amazon) | [Deutsch](https://books2read.com/vpnguidede?store=amazon) | [Français](https://books2read.com/vpnguidefr?store=amazon)]
 
 ## Quick start