Add OCR to `/find/` response

[TimJentzsch]

Relevant issue: Closes #235

Description:

The /find/ endpoint will now also create the OCR transcription if one is available for the given post.

Checklist:

• [x] Code Quality
• [x] Pep-8
• [x] Tests (if applicable)
• [x] Success Criteria Met
• [x] Inline Documentation
• [ ] Wiki Documentation (if applicable)