Fix navigation links and update reference to Advanced section

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>

Author: Copilot

docs/components/index.mdx

@@ -175,15 +175,15 @@ All ObjectUI components share these characteristics:
 
 ## Next Steps
 
-- **[Quick Start Guide](/guide/quick-start)** - Build your first ObjectUI app
-- **[Schema Rendering](/concepts/schema-rendering)** - Learn how the engine works
-- **[Component Registry](/concepts/component-registry)** - Register custom components
-- **[Expressions](/concepts/expressions)** - Dynamic values with expressions
+- **[Quick Start Guide](/docs/guide/quick-start)** - Build your first ObjectUI app
+- **[Schema Rendering](/docs/concepts/schema-rendering)** - Learn how the engine works
+- **[Component Registry](/docs/concepts/component-registry)** - Register custom components
+- **[Expressions](/docs/concepts/expressions)** - Dynamic values with expressions
 
 ## Need Help?
 
 Can't find what you're looking for? Check out:
 
-- [Concepts](/concepts) - Core concepts and architecture
-- [Reference](/reference) - API documentation and protocol specs
+- [Concepts](/docs/concepts) - Core concepts and architecture
+- [Advanced](/docs/reference) - API documentation and protocol specs
 - [GitHub](https://github.com/objectstack-ai/objectui) - Report issues or contribute