chore: migrate repository to standard knowledge base layout

skills/polymarket/references/index.md

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+# Polymarket Documentation Index
+
+## Platform Documentation
+
+- **api.md** - Polymarket API documentation
+- **getting_started.md** - Getting started guide
+- **guides.md** - Development guides
+- **learn.md** - Learning resources
+- **trading.md** - Trading and market operations
+- **other.md** - Additional resources and tools
+
+## Real-Time Data Streaming
+
+- **realtime-client.md** - WebSocket real-time data client (complete API reference)
+- **README.md** - Platform overview
+
+## LLM Integration
+
+- **llms.md** - LLM integration guide (summary)
+- **llms-full.md** - Complete LLM documentation
+
+---
+
+**Use these reference files for detailed information on specific topics.**