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docs/index.md

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+# SimbaRAG Documentation
+
+SimbaRAG is a RAG-powered conversational AI system with enterprise authentication.
+
+## Architecture
+
+- **Backend**: Quart (async Python) with Tortoise ORM
+- **Vector Store**: LangChain with configurable embeddings
+- **Auth Stack**: LLDAP → Authelia → OAuth2/OIDC
+- **Database**: PostgreSQL
+
+## Sections
+
+- [Authentication](authentication.md) - OIDC flow, user management, and RBAC planning