docs: add missing observability articles to sidebar (#412)

* docs: add missing observability articles to sidebar

- Add distributed-tracing to observability section
- Add open-webui-integration to observability section
- Rename observability.md to metrics.md for better clarity
- Remove tracing-quickstart.md as it's no longer needed

This ensures all observability documentation is accessible through
the website sidebar navigation.

Signed-off-by: bitliu <bitliu@tencent.com>

* more

Signed-off-by: bitliu <bitliu@tencent.com>

---------

Signed-off-by: bitliu <bitliu@tencent.com>

Author: Xunzhuo

website/docs/tutorials/observability/observability.md renamed to website/docs/tutorials/observability/metrics.md

@@ -1,4 +1,4 @@
-# Observability
+# Metrics & Monitoring
 
 Metrics collection and visualization for Semantic Router using Prometheus and Grafana.
 

website/docs/tutorials/observability/tracing-quickstart.md

@@ -162,4 +162,4 @@ The in-memory cache automatically manages memory through:
 
 - **[Milvus Cache](./milvus-cache.md)** - Set up persistent, distributed caching
 - **[Cache Overview](./overview.md)** - Learn about semantic caching concepts
-- **[Observability](../observability/observability.md)** - Monitor cache performance
+- **[Observability](../observability/overview.md)** - Monitor cache performance

website/docs/tutorials/semantic-cache/in-memory-cache.md

@@ -145,5 +145,5 @@ curl -X POST http://localhost:8080/v1/chat/completions \
 ## Next Steps
 
 - **[In-Memory Cache](./in-memory-cache.md)** - Compare with in-memory caching
-- **[Cache Overview](./overview.md)** - Learn semantic caching concepts  
-- **[Observability](../observability/observability.md)** - Monitor Milvus performance
+- **[Cache Overview](./overview.md)** - Learn semantic caching concepts
+- **[Observability](../observability/overview.md)** - Monitor Milvus performance

website/docs/tutorials/semantic-cache/milvus-cache.md

@@ -87,7 +87,9 @@ const sidebars: SidebarsConfig = {
           label: 'Observability',
           items: [
             'tutorials/observability/overview',
-            'tutorials/observability/observability',
+            'tutorials/observability/metrics',
+            'tutorials/observability/distributed-tracing',
+            'tutorials/observability/open-webui-integration',
           ],
         },
       ],