Adding lightning API docs on docs.openfn.org

**Description**
This ticket is for research and planning for how we can incorporate lightning public api docs in docs.openfn.org. 

**Resources**
- [Docusaurus Plugin OpenAPI](https://www.npmjs.com/package/docusaurus-plugin-openapi)
- [Public API Docs Concept](https://docs.google.com/document/d/1gs6Jx4L1tLjjcoIqHEXJ_SmKcKH4Ck0jxXzCOCvszgo/edit?tab=t.0#heading=h.aq2l9f2pqc1p) 