fix: improve langchain agent auth page (#189)

- move the page to be under langgraph-platform instead of oss
- rename LangChain Agent Auth to just Agent Auth
- the package is now available on PyPi, so we can mention that instead
of saying "unavailable"

---------

Co-authored-by: Lauren Hirata Singh <[email protected]>

Author: samecrowder

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

@@ -1,16 +1,15 @@
 ---
-title: LangChain Agent Auth
+title: Agent Auth
 ---
-LangChain Agent Auth enables secure access from agents to any other system using OAuth 2.0 credentials. With LangChain Agent Auth, build your agents to securely connect to any system on a person's behalf.
-
-## Overview
-
-LangChain Agent Auth solves the challenge of secure authentication for autonomous agents. Instead of embedding credentials in agent code or requiring manual intervention for each API call, agents use the OAuth flow to obtain time-limited access tokens for external services. The system includes an authentication server for managing OAuth flows and storing credentials, as well as a Python client SDK for integrating with agents.
-
+Agent Auth enables secure access from agents to any other system using OAuth 2.0 credentials. With Agent Auth, build your agents to securely connect to any system on a person's behalf.
 
 ## Installation
 
-The client library is not yet publicly available. To request access, please reach out to LangChain support at [email protected]. The package will be released on PyPI soon.
+Install the Agent Auth client library from PyPI:
+
+```bash
+pip install langchain-auth
+```
 
 
 ## Quickstart
@@ -36,8 +35,6 @@ github_provider = await client.create_oauth_provider(
     client_secret="your-github-client-secret",
     auth_url="https://github.com/login/oauth/authorize",
     token_url="https://github.com/login/oauth/access_token",
-    user_info_url="https://api.github.com/user",
-    scopes=["repo"] # Provide one or more scopes you would like to be available for this provider
 )
 ```