docs: improve README formatting and structure

[devin-ai-integration]

Documentation: Improve README Formatting and Structure

This PR improves the formatting and structure of the README.md file to make it more readable and consistent.

Changes

• Added proper hierarchical headings
• Improved code block formatting with language hints
• Organized setup instructions into clear sections
• Enhanced readability with better spacing and structure
• Added clearer section numbering for manual setup

Type of Change

• Documentation improvement
• No functional changes

Testing

• Verified markdown rendering locally
• No functional testing needed as this is a documentation-only change

Link to Devin run: https://app.devin.ai/sessions/14a2135c9c14414989adbd720877d6ff

[devin-ai-integration]

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