docs: 更新文档站链接为 capa.rxcloud.group

Author: kevinten10

README.md

@@ -8,7 +8,7 @@ With the help of the Capa project, your Java applications have the ability to ru
 
 [中文文档](./README_ZH.md)
 
-[介绍文章](https://capa-cloud.github.io/capa.io/blog/2022/01/18/capa-mecha-sdk-of-cloud-application-api/)
+[介绍文章](https://capa.rxcloud.group/blog/2022/01/18/capa-mecha-sdk-of-cloud-application-api/)
 
 ## Motivation