docs: condense and reorganize README for better clarity

[murrayju]

Summary

• Added Quick Start section combining clone, install, env setup, and build steps
• Consolidated development commands into concise bullet list format
• Streamlined deployment section with shorter descriptions
• Simplified secrets section to reference commands rather than repeat them
• Improved document structure and readability

The README is now more scannable and easier to follow while retaining all essential information.

🤖 Generated with Claude Code

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