Adds the gTTS (Google Text-to-Speech) Python library as a fallback for text-to-speech conversion in the speak.py file. The changes were made to ensure that users can still convert text to speech even if the ElevenLabs API key is not set or if the API encounters an error. Additionally, the requirements.txt file has been updated to include the new gTTS dependency.
- Removed `keys.py`.
- Added `.env.template`.
- Added `.env` to `.gitignore`.
- Updated various files that imported `keys` to use `os.getenv` instead.
- Updated `requirements.txt` dependencies.
- Updated README.md with instructions on setting up environment variables.
This change improves security, flexibility, and makes it easier to use Auto-GPT in notebooks. Environment variables are stored in `.env` and loaded via `load_dotenv()` in `scripts/main.py`.
