609 docs improve contributingmd

[cpaniaguam]

This pull request includes updates to the docs/CONTRIBUTING.md file to improve clarity and organization. The changes introduce a Table of Contents, reorganize the contribution guidelines, and provide more detailed instructions for contributing to the HSSM project.

Documentation improvements:

• Added a Table of Contents to the docs/CONTRIBUTING.md file for easier navigation.
• Reorganized the sections on ways to contribute, opening issues, and the pull request process to improve readability and flow.
• Enhanced the step-by-step instructions for creating a pull request, including adding links to relevant GitHub documentation and emphasizing the importance of using feature branches.
• Provided detailed guidance on using Poetry for dependency management, including how to add new dependencies and commit changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

[AlexanderFengler]

lgtm