Improve README formatting and clarity

[kWeglinski]

This pull request improves the README file with several enhancements:

Changes Made:

1. Added Language Annotations: Added proper yaml language annotations to code blocks for better clarity
2. Improved Section Headings: Made section headings more consistent and descriptive
3. Enhanced Readability:
   • Improved the introduction to be more welcoming
   • Made the "Running and Building Locally" section more step-by-step with numbered instructions
4. Better Image Descriptions: Updated alt text for images to be more descriptive and accessible
5. Formatting Improvements:
   • Fixed YAML formatting in Docker configurations (proper indentation and syntax)
   • Improved list formatting and spacing
6. Added Missing Information: Included information about available ports from runtime information

These changes make the README more professional, easier to read, and more helpful for users who want to set up and use OmniPoly.

Key Improvements:

• Added clear section headings with proper hierarchy
• Improved Docker configuration examples with correct YAML syntax
• Added helpful notes about available ports for local development
• Made the documentation more accessible with better image descriptions
• Enhanced the overall reading experience with consistent formatting

The changes are focused on improving documentation without modifying any functional code.