docs: publish prebuilt page (#3305)

Publish prebuilt page

docs/docs/prebuilt.md

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+[//]: # (This file is automatically generated using a script in docs/_scripts. Do not edit this file directly!)
+# 🚀 Prebuilt Libraries
+
+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
+
+| Name | GitHub URL | Description | Weekly Downloads |
+| --- | --- | --- | --- |
+| **trustcall** | [hinthornw/trustcall](https://github.com/hinthornw/trustcall) | Tenacious tool calling built on LangGraph | 7081 |
+
+## ✨ Contributing Your Library
+
+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](https://github.com/langchain-ai/langgraph/blob/main/docs/_scripts/third_party_page/packages.yml) 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! 🚀