AI Module Week 6 Topic 4: Rag with llamaindex

[EricThomson]

People won't typically be writing their own RAG pipelines: Llamaindex is the main tool for RAG.

This will be a brief intro to Llamaindex and how to use it for RAG pipelines. Main point is to replicate steps from Issue #64 using Llamaindex: will go from ~100 lines of code down to 4 lines of code for basic semantic RAG!