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)

Start by reviewing DevDocs' process for adding a documentation source, then inspect the linked Expo modules overview and Expo repository documentation. Done means Expo's documentation is available through DevDocs, with the relevant content included and usable by React Native developers.

Written by the indexing model from the issue text.