docs: Revert "docs: Delete LGP nav Items from docs" (#5753)

Reverts langchain-ai/langgraph#5743

docs/docs/cloud/reference/api/api_ref.md

@@ -0,0 +1,22 @@
+# LangGraph Server API Reference
+
+The LangGraph Server API reference is available within each deployment at the `/docs` endpoint (e.g. `http://localhost:8124/docs`).
+
+Click <a href="/langgraph/cloud/reference/api/api_ref.html" target="_blank">here</a> to view the API reference.
+
+## Authentication
+
+For deployments to LangGraph Platform, authentication is required. Pass the `X-Api-Key` header with each request to the LangGraph Server. The value of the header should be set to a valid LangSmith API key for the organization where the LangGraph Server is deployed.
+
+Example `curl` command:
+```shell
+curl --request POST \
+  --url http://localhost:8124/assistants/search \
+  --header 'Content-Type: application/json' \
+  --header 'X-Api-Key: LANGSMITH_API_KEY' \
+  --data '{
+  "metadata": {},
+  "limit": 10,
+  "offset": 0
+}'
+```