Release v3.7.0

[jonhealy1]

Added

• Added a comprehensive Table of Contents to README.md #247
• Added Sponsors and Supporters section to README.md with organizational logos and acknowledgments #247
• Added --pydantic option for validating STAC objects using stac-pydantic models, providing enhanced type checking and validation #249
• Added optional dependency for stac-pydantic that can be installed with pip install stac-validator[pydantic] #249
• Added GitHub Actions workflow for automatically building and deploying documentation to GitHub Pages #250

Changed

• Reformatted and restructured the README.md for improved readability and organization #247
• Migrated documentation from Read the Docs to GitHub Pages for better integration with the repository #250
• Updated documentation system to use Sphinx with MyST parser for improved Markdown support #250
• Enhanced documentation to include content directly from README.md for consistency #250