fix: 更新 RT-Thread 仓库图标链接为新的 favicon

Author: dongly

README.md

@@ -394,7 +394,7 @@ If you encounter other issues, please:
 | Type | Link | Mirror |
 |------|------|--------|
 | 📦 Env Repository | [GitHub](https://github.com/RT-Thread/env) | [Gitee](https://gitee.com/RT-Thread-Mirror/env) |
-| ![RT-Thread](https://www.rt-thread.org/static/imgs/headerNav/site_icon.png) RT-Thread Repository | [GitHub](https://github.com/RT-Thread/rt-thread) | [Gitee](https://gitee.com/rtthread/rt-thread) |
+| ![RT-Thread](https://www.rt-thread.org/favicon.ico) RT-Thread Repository | [GitHub](https://github.com/RT-Thread/rt-thread) | [Gitee](https://gitee.com/rtthread/rt-thread) |
 | 🌐 Official Website | [RT-Thread Website](https://www.rt-thread.org/) ||
 | 📚 Documentation | [RT-Thread Docs (EN)](https://www.rt-thread.io/document/site/) | [RT-Thread Docs (CN)](https://www.rt-thread.org/document/site/#/) |
 

README_ZH.md

@@ -394,7 +394,7 @@ sudo chown -R $USER:$USER ~/.rt-env
 | 类型 | 链接 |镜像|
 |------|------|----|
 | 📦 Env 仓库 | [GitHub](https://github.com/RT-Thread/env) |[Gitee](https://gitee.com/RT-Thread-Mirror/env) |
-| ![RT-Thread](https://www.rt-thread.org/static/imgs/headerNav/site_icon.png) RT-Thread 仓库|[GitHub](https://github.com/RT-Thread/rt-thread) |[Gitee](https://gitee.com/rtthread/rt-thread) |
+| ![RT-Thread](https://www.rt-thread.org/favicon.ico) RT-Thread 仓库|[GitHub](https://github.com/RT-Thread/rt-thread) |[Gitee](https://gitee.com/rtthread/rt-thread) |
 | 🌐 官方网站 | [RT-Thread 官网](https://www.rt-thread.org/) ||
 | 📚 文档中心 | [RT-Thread 文档(英文)](https://www.rt-thread.io/document/site/) |[RT-Thread 文档中心(中文)](https://www.rt-thread.org/document/site/#/)|