Allow for "Audio Mode" to let users speak via microphone/hear responses via speakers

[codexcommunion]

A few resources to support this:

https://docs.amplify.aws/react/build-a-backend/add-aws-services/predictions/set-up-predictions/

https://docs.amplify.aws/react/build-a-backend/add-aws-services/predictions/transcribe-audio/

https://docs.aws.amazon.com/polly/latest/dg/available-voices.html