update: update menu items

Author: Maplemx

mkdocs.yml

@@ -7,7 +7,9 @@ repo_name: AgentEra/Agently
 docs_dir: docs
 
 nav:
-  - Overview: index.md
+  - Overview:
+      - Overview: index.md
+      - Engineering Challenges: engineering_challenges.md
   - Getting Started:
       - Installation: getting_started/installation.md
       - Quickstart: getting_started/quickstart.md
@@ -110,6 +112,7 @@ plugins:
             Auto Loop: 自规划工作流实战
             FastAPI Service: FastAPI 服务封装
             Common Pitfalls: 常见问题
+            Engineering Challenges: 工程落地挑战
 
 markdown_extensions:
   - admonition