[Streaming] capability added with setup script, readme updates, and narrator prompt update

[rsmets]

Summary

• Added a setup.sh script to facilitate getting the two shell envs setup to run capture.py and narrator.py.Also, updated README with setup.sh usage info. From [Setup] script and readme updated #32
• Updated to the narrator GPT prompt to explicitly have it describe the image as David Attenborough for increased complex descriptors (and humor). From [Narrator] prompt to describe the image like David Attenborough for increased complex descriptors. #33
• Adds the ability to stream the Eleven Labs text to voice which creates a more immediate experience.
• Format linting