docs: publish prebuilt page (#3305)

Publish prebuilt page

docs/_scripts/third_party_page/create_third_party_page.py

@@ -8,9 +8,14 @@ from typing import TypedDict
 import yaml
 
 MARKDOWN = """\
-# 🚀 Third-party Libraries 
+[//]: # (This file is automatically generated using a script in docs/_scripts. Do not edit this file directly!)
+# 🚀 Prebuilt Libraries
 
-A collection of third-party libraries that extend LangGraph's functionality.
+LangGraph includes a prebuilt React agent. For more information on how to use it, 
+check out our [how-to guide](https://langchain-ai.github.io/langgraph/how-tos/#prebuilt-react-agent).
+
+If you’re looking for other prebuilt libraries, explore the community-built options 
+below. These libraries can extend LangGraph's functionality in various ways.
 
 ## 📚 Available Libraries
 
@@ -18,7 +23,21 @@ A collection of third-party libraries that extend LangGraph's functionality.
 
 ## ✨ Contributing Your Library
 
-If you'd like to add your library to this list, please open a pull request on the {langgraph_url}.
+Have you built an awesome open-source library using LangGraph? We'd love to feature 
+your project on the official LangGraph documentation pages! 🏆
+
+To share your project, simply open a Pull Request adding an entry for your package in our [packages.yml]({langgraph_url}) file.
+
+**Guidelines**
+
+- Your repo must be distributed as an installable package (e.g., PyPI for Python, npm 
+  for JavaScript/TypeScript, etc.) 📦
+- The repo should either use the Graph API (exposing a `StateGraph` instance) or 
+  the Functional API (exposing an `entrypoint`).
+- The package must include documentation (e.g., a `README.md` or docs site) 
+  explaining how to use it.
+  
+We'll review your contribution and merge it in!
 
 Thanks for contributing! 🚀
 """
@@ -47,9 +66,15 @@ def generate_markdown(resolved_packages: List[ResolvedPackage], language: str) -
     """
     # Update the URL to the actual file once the initial version is merged
     if language == "python":
-        langgraph_url = "https://github.com/langchain-ai/langgraph/pulls"
+        langgraph_url = (
+            "https://github.com/langchain-ai/langgraph/blob/main/docs"
+            "/_scripts/third_party_page/packages.yml"
+        )
     elif language == "js":
-        langgraph_url = "https://github.com/langchain-ai/langgraphjs/pulls"
+        langgraph_url = (
+            "https://github.com/langchain-ai/langgraphjs/blob/main/docs"
+            "/_scripts/third_party/packages.yml"
+        )
     else:
         raise ValueError(f"Invalid language '{language}'. Expected 'python' or 'js'.")
 
@@ -57,7 +82,7 @@ def generate_markdown(resolved_packages: List[ResolvedPackage], language: str) -
         resolved_packages, key=lambda p: p["weekly_downloads"] or 0, reverse=True
     )
     rows = [
-        "| Name | GitHub URL | Description | Downloads |",
+        "| Name | GitHub URL | Description | Weekly Downloads |",
         "| --- | --- | --- | --- |",
     ]
     for package in sorted_packages: