Added two developer guide and removed from README ' builder docker image' and 'launch service from source' (#2590)

Update and rename agentic_rag_introduction.md to agent_introduction.md (#2443)

Update _category_.json (#2442)

minor (#2422)

Initial draft of Create a General-purpose chatbot (#2411)

Fixed a docusaurus display issue (#2340)

Added a brief introduction to Agentic RAG (#2331)