[UPDATE] Create Optional LiteLLMModel Code Blocks/Notebook to Enable Course Takers Use Free Models Without Limitations

I've been taking this course for a while now and one persistent issue that I see myself and other users alike seem to come across is getting errors when executing code blocks in notebooks due to hitting HuggingFace Inference Usage Limitations when using the `HfApiModel` in notebooks. This negatively harms users learning experience and I don't think learners should be experiencing this issue while learning. I recommend one of 3 solutions:

1. Swap to `LiteLLModel` to enable users use cheaper or free inference models like Google Gemini
2. Create duplicate notebooks that use `LiteLLMModel` instead of `HfApiModel`
3. Create duplicate code blocks within the same notebook that uses `LiteLLMModel` while keeping the original `HfApiModel` code blocks