[v4.3.7] Minor improvements (demo/kata/chatbot)
Fixed
Chatbot mixtral has been deprecated so, Groq model has been updated to versatile series.
Improve katas' solutions (markdown documents and configuraton files)
Common resources have been refactored and demo/play/kata adapted.
Docker images
https://github.com/users/testillano/packages/container/package/h2agent
https://github.com/users/testillano/packages/container/package/h2agent_builder
https://github.com/users/testillano/packages/container/package/h2agent_training