Try moving file, update image references (#161)

https://langchain.slack.com/archives/C04GWPE38LV/p1755188202814179

Author: beklapko

src/langchain-agent-auth.mdx renamed to src/oss/langchain-agent-auth.mdx

@@ -77,11 +77,11 @@ auth_result = await client.authenticate(
 
 During execution, if authentication is required, the SDK will throw an [interrupt](https://langchain-ai.github.io/langgraph/how-tos/human_in_the_loop/add-human-in-the-loop/#pause-using-interrupt). The agent execution pauses and presents the OAuth URL to the user:
 
-![LangGraph Studio interrupt showing OAuth URL](./images/langgraph-auth-interrupt.png)
+![LangGraph Studio interrupt showing OAuth URL](../../images/langgraph-auth-interrupt.png)
 
 After the user completes OAuth authentication and we receive the callback from the provider, they will see the auth success page.
 
-![GitHub OAuth success page](./images/github-auth-success.png)
+![GitHub OAuth success page](../../images/github-auth-success.png)
 
 The agent then resumes execution from the point it left off at, and the token can be used for any API calls. We store and refresh OAuth tokens so that future uses of the service by either the user or agent do not require an OAuth flow.