docs: restructure README for better readability and compactness

- Convert Features section to bulleted list with cleaner formatting
- Consolidate Installation section (merge npm, source, dev)
- Simplify Quick Start to essential commands only
- Convert Commands to table format for better scannability
- Compress Input Format with inline examples
- Shorten Output Example while keeping key information
- Streamline Troubleshooting with compact format
- Move detailed release process to docs/RELEASE.md
- Consolidate Development section (setup, commands, testing)
- Reduce overall size by ~55% (444 → ~200 lines)
- Keep all essential information while improving readability

Author: mynameistito