Include support for Expo documentation

# Feature request

## Summary

Thank you for providing us a fast and accessible interface for all documentations.

This ticket, aims to help mobile developers, specifically, React Native Developers enhance their `RN-Expo` workflow by bringing Expo's docs to DevDocs.io.

Please add this documentation to devdocs.

## References

Modules: https://docs.expo.dev/modules/overview/
GH: https://github.com/expo/expo/tree/master/docs (I am curious, if this is any helpful)

首先查看 DevDocs 添加文档源的流程，然后检查链接的 Expo 模块概览和 Expo 仓库文档。当 Expo 的文档可通过 DevDocs 获取，且包含相关内容并可供 React Native 开发者使用时，即表示完成。

由索引模型根据 Issue 内容生成。