Fix broken link to deleted index.html and remove unused navigation.json

Author: dadongshangu

tutorials/README.md

@@ -82,7 +82,7 @@
 
 ## 🔗 相关资源
 
-- [项目主页](../../index.html)
+- [项目主页](../../README.html)
 - [实践项目](../examples/)
 - [参考资源](vibe-coding/beginner-guide.html#参考资源)