Refactor field extraction notebook to enhance clarity and structure (#75)

* Refactor field extraction notebook to enhance clarity and structure

- Updated introductory markdown to provide a clearer overview of the notebook's purpose and modalities covered.
- Organized content into distinct sections for Document Analysis, Audio Analysis, Video Analysis, and Image Analysis.
- Added detailed explanations for each analyzer template and its components.
- Included step-by-step instructions for creating and running analyzers for invoices, receipts, call recordings, and marketing videos.
- Enhanced markdown descriptions for clarity and improved user guidance throughout the notebook.
- Implemented cleanup procedures for analyzers after use to manage resources effectively.
- Updated Python version in metadata.

* Implement feature X to enhance user experience and fix bug Y in module Z

Author: yungshinlintw