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

Reverts langchain-ai/langgraph#5743

docs/docs/cloud/reference/sdk/python_sdk_ref.md

@@ -0,0 +1,17 @@
+# Python SDK Reference
+
+::: langgraph_sdk.client
+    handler: python
+
+
+::: langgraph_sdk.schema
+    handler: python
+
+::: langgraph_sdk.auth
+    handler: python
+
+::: langgraph_sdk.auth.types
+    handler: python
+
+::: langgraph_sdk.auth.exceptions
+    handler: python