docs: restructure README.md — 2,539 → 209 lines (#247)
- Cut from 2,539 lines / 73 sections to 209 lines / 18 sections - Consolidated 4 install methods into one unified section - Moved all skill details to domain-level READMEs (linked from table) - Front-loaded value prop and keywords for SEO - Added POWERFUL tier highlight section - Added skill-security-auditor showcase section - Removed stale Q4 2025 roadmap, outdated ROI claims, duplicate content - Fixed all internal links - Clean heading hierarchy (H2 for main sections only) Closes #233 Co-authored-by: Leo <leo@openclaw.ai>
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