update sponsor page

Author: vincentlauvlwj

source/en/sponsor.md

@@ -17,3 +17,7 @@ Please sponsor the project if it really helped you. Thank you for your contribut
 ## Wechat
 
 <img src="/images/wechat-sponsor.jpg" alt="Wechat" style="width: min(100%, 400px)"/>
+
+## Alipay
+
+<img src="/images/alipay-sponsor.jpg" alt="Alipay" style="width: min(100%, 400px)"/>

source/zh-cn/sponsor.md

@@ -12,6 +12,10 @@ related_path: en/sponsor.html
 
 <img src="/images/wechat-sponsor.jpg" alt="微信" style="width: min(100%, 400px)"/>
 
+## 支付宝
+
+<img src="/images/alipay-sponsor.jpg" alt="支付宝" style="width: min(100%, 400px)"/>
+
 ## PayPal
 
 > https://www.paypal.me/vincentlauvlwj