Simplify and clarify PR instructions and community guidelines

[Danielkis97]

This PR improves the CONTRIBUTING.md by simplifying and clarifying content:

Streamlined "Push and Create Pull Request" steps for easier understanding.
Shortened "Community Guidelines" descriptions for better readability.

Changes:

Reduced verbosity in PR instructions.
Condensed guideline explanations while keeping key points.
Ensured concise and user-friendly text.

No functional changes; purely a documentation improvement.

[Copilot]

Pull Request Overview

This PR simplifies and clarifies the CONTRIBUTING.md documentation by improving the readability of pull request instructions and community guidelines. The changes focus on making the contribution process more accessible to new contributors.

• Expanded the "Push and Create Pull Request" section with step-by-step instructions
• Enhanced community guidelines with detailed explanations while maintaining conciseness
• Improved overall documentation clarity without changing any functional aspects

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[riemannulus]

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