Update llmu notebooks

[mrmer1]

This PR makes changes to the CO-1T wireless headphone marketing copy, the chatbot functionality, and the notebook file names.

Marketing Copy

The CO-1T wireless headphone copy has been updated to include:

• A new section for software developers, highlighting the benefits of the headphones in noisy office environments.
• A key features section, highlighting:
  • Superior sound quality
  • Active noise-canceling technology
  • Seamless wireless connectivity
  • Intuitive touch controls
  • Ergonomic design
  • Impressive battery life
  • Portable charging case

Chatbot Functionality

The chatbot functionality has been improved by:

• Changing the model from command-r to command-r-plus.
• Adding a new function, run_chatbot, to handle the interaction between the user and the chatbot.
• Updating the run method to:
  • Generate search queries, if any.
  • Retrieve documents for each query and respond.
  • Directly respond if there are no search queries.
• Printing the chatbot response, citations, and documents.

Notebook File Names

The following notebook file names have been updated:

• What_Is_Similarity_Between_Sentences.ipynb to Introduction_Text_Embeddings.ipynb
• Visualizing_Text_Embeddings.ipynb to Introduction_Text_Embeddings.ipynb