Fix qa_chain typo

Support GPT-4 if user's OpenAI API key allows access.

Update requirements.txt with updated libraries. Modify prompt for translation and grade level.

Address textbox change issue

Remove unnecessary code, and address WolframAlpha interfacing issue.

Implement embeddings

Run on CPU

Run on CPU

Implement embeddings

Enable Whisper

Speak with Polly voices

Add WolframAlpha tool

Continue improving conversational agent

Initial commit