docs: cleanup (#5401)

* docs: cleanup

* fix nav

* fix

* fix nits

docs/docs/tutorials/multi_agent/agent_supervisor.md

@@ -206,7 +206,7 @@ Name: tavily_search
 
 ### Math agent
 
-For math agent tools we will use [vanilla Python functions](../../agents/tools.md#define-simple-tools):
+For math agent tools we will use [vanilla Python functions](../../how-tos/tool-calling.md#define-a-tool):
 
 ```python
 def add(a: float, b: float):

docs/docs/tutorials/overview.md

@@ -1,21 +0,0 @@
-# Examples
-
-The pages in this section provide end-to-end examples for the following topics:
-
-## General 
-
-- [Agentic RAG](./rag/langgraph_adaptive_rag.ipynb)
-- [Agent Supervisor](./multi_agent/agent_supervisor.md)
-- [SQL agent](./sql/sql-agent.md)
-- [Graph runs in LangSmith](../how-tos/run-id-langsmith.md)
-
-## LangGraph Platform
-
-- [Set up custom authentication](./auth/getting_started.md)
-- [Make conversations private](./auth/resource_auth.md)
-- [Connect an authentication provider](./auth/add_auth_server.md)
-- [Rebuild graph at runtime](../cloud/deployment/graph_rebuild.md)
-- [Use RemoteGraph](../how-tos/use-remote-graph.md)
-- [Deploy CrewAI, AutoGen, and other frameworks](../how-tos/autogen-integration.md)
-- [Integrate LangGraph into a React app](../cloud/how-tos/use_stream_react.md)
-- [Implement Generative User Interfaces with LangGraph](../cloud/how-tos/generative_ui_react.md)