docs: site home page (#42)

add home page github buuton
before:

![image](https://github.com/user-attachments/assets/3f870335-da41-4a84-80d9-5a6ec7191d22)

after :

![image](https://github.com/user-attachments/assets/bc4ba01a-0048-4f82-aa36-e838de0126bc)

Author: ztygod

docs/docs/zh/index.md

@@ -5,13 +5,13 @@ hero:
   name: MateChat React
   text: AI 场景解决方案
   tagline: 基于 DevUI Design 的 AI 场景前端解决方案
-  # actions:
+  actions:
   #   - theme: brand
   #     text: 快速开始
   #     link: guide/start/introduction
-  #   - theme: alt
-  #     text: GitHub
-  #     link: https://github.com/DevCloudFE/matechat-react
+    - theme: alt
+      text: GitHub
+      link: https://github.com/DevCloudFE/matechat-react
   image:
     src: /matechat-icon.svg
 
@@ -39,4 +39,4 @@ features:
   - title: 面向生产环境准备
     details: 经过良好测试，可无缝集成至 Next.js、Vite、等主流 React 应用中。
     icon: 🚀
----
+---