add autogenerated summary in front matter

[adamjonas]

Add a summary for the transcription in the front matter.

Open questions:

• GPT3.5 is ideal, but open to exploring other summary engines.

[adamjonas]

enabled for deepgram, not yet for whisper

[KartikBansal4976]

Hi maintainers,

I was exploring this repository and found this issue interesting. I would like to contribute to solving this issue.

Could you please let me know if I can work on it and if there are any guidelines or suggestions before I begin?

Thanks!