Add psychic integration

[jasonwcfan]

Summary

Add psychic as a source of documents for superagent's backend.

Fixes

• N/a

Depends on

• no new dependencies

Test plan

• will test locally before merging in

Screenshots

Types of changes

Checklist

• [x] My code follows the code style of this project and passes {style_guide_run_command}.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] My change has adequate Unit Test coverage.