Update README.md to enhance documentation structure and clarity

- Added a Table of Contents for easier navigation.
- Reorganized sections for better flow, including a new Overview section.
- Clarified the pipeline workings and user experience consistency.
- Expanded the Run with Docker Compose section with prerequisites and quick start instructions.
- Included detailed environment variable references and performance tuning options.
- Enhanced explanations for Ethscriptions creation and transfer methods.

Author: RogerPodacter