update CONTRIBUTING.md

[kjaymiller]

Issue Link 🔗:

Issue: #732

Type of Change

• Bug fix 🐞
• New feature/page
• Documentation update
• Other

Description 📋

Updates the CONTRIBUTING.md

• Converted Mermaid to a standard tree style view
• Removed references to jekyll
• Updated to talk about Render Engine
• uses uv

Checklist ✅

• Followed the Code of Conduct and Contribution Guide
• Ran pre-commit run --all
• All tests pass locally
• Added tests (if applicable)
• Documentation updated (if applicable)

Additional Notes & Screenshots

Add any additional notes or comments that might be helpful for the reviewers.

[Copilot]

Pull Request Overview

This PR updates the CONTRIBUTING.md file to reflect the migration from Jekyll to Render Engine as the static site generator and adopts UV as the Python package manager.

• Replaced Mermaid diagrams with standard tree-style directory structures for better readability
• Updated all development instructions to use UV instead of Jekyll/Bundle commands
• Added documentation for Render Engine page creation patterns

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[lazouich]

A clarity tweak that might be worth considering is to separate commands from sentences and turn them into bash/shell code blocks