Update slack bot models with llama-index changes

[rchan26]

Fixes:

• 73

• 74

• 75

Also:

• Update notebooks using Huggingface LLM
• Update the Azure OpenAI notebook
• Renaming "Llama..." classes to "LlamaIndex..." classes

[review-notebook-app[bot]]

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[rchan26]

@rwood-97 thanks! yes that looks like a good fix for accelerate