docs: add comprehensive RAG handbook with cross-linking to Unrag docs

[pingSubhajit]

Summary

• Add complete RAG Handbook covering retrieval-augmented generation from first principles to production operations
• Add promotional banner for the handbook in the docs right sidebar (table of contents)
• Cross-link the handbook throughout Unrag documentation where concepts align

What's included

RAG Handbook (new)

A comprehensive 9-module guide covering:

• Module 0: Orientation - RAG fundamentals, production architecture, quality-latency-cost tradeoffs
• Module 1: Foundations - Embeddings, chunking basics, metadata, indexing, score calibration
• Module 2: Data and Ingestion - Content sources, pipelines, cleaning, document modeling
• Module 3: Chunking and Representation - Chunk sizing, structure-aware strategies, multi-representation indexing
• Module 4: Retrieval - topK, thresholds, hybrid retrieval, query rewriting, filtering, caching
• Module 5: Reranking and Context - Two-stage retrieval, cross-encoders, LLM reranking, context compression
• Module 6: Generation - Grounding prompts, answer formats, chat, agents, hallucination handling
• Module 7: Evaluation - Measuring quality, building datasets, offline/online evaluation
• Module 8: Production and Ops - Observability, latency, cost controls, security, scaling
• Appendix - Launch checklist, security checklist, evaluation checklist, glossary, failure modes reference

Includes 45 Excalidraw diagrams with exported PNGs for visual explanations.

Handbook Banner

Added a promotional banner component that appears below the table of contents in the right sidebar on all Unrag docs pages, linking to the RAG handbook.

Cross-linking

Added contextual links to relevant handbook modules from Unrag docs:

• getting-started/introduction.mdx - Links to handbook for RAG newcomers
• concepts/philosophy.mdx - Card linking to handbook for deep dives
• concepts/architecture.mdx - Links to orientation module on pipelines
• concepts/chunking.mdx - Links to Module 3 on chunking strategies
• concepts/performance.mdx - Links to Module 8 on production operations
• batteries/reranker.mdx - Links to Module 5 on reranking
• batteries/eval.mdx - Links to Module 7 on evaluation
• guides/use-with-chat.mdx - Links to Module 6 on generation

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Project	Deployment	Review	Updated (UTC)
unrag-web	Ready	Preview, Comment	Jan 10, 2026 7:59pm