Add Panel contents in preparation for Pycon

[ahuang11]

Based on the following outline:

Create a chat UI with Panel [30 mins]
Introduction to Panel and the broader HoloViz ecosystem of visualization tools
Create a basic chat UI using Panel’s ChatInterface (still in the Jupyter Notebook)
Hands-on section where participants will follow along by filling in sections themselves
Develop an application [30 mins]
Create a Panel application with the previously created chat interface
Add other components like headers, sidebars, and more to the application
Serve (deploy) the application and share it with other participants on the platform[3]
Conclusion [10-15 mins]
Answer participant questions
Participants can explore fellow learners’ applications
Discuss other OSS projects in this area, along with their capabilities and challenges
Share resources to continue learning about RAGs and web-application development

However, I haven't timed it yet. Also, feel free to make changes!

I'm wondering whether I should use OpenAI or llama-cpp-python or ragna for the LLM API?

[review-notebook-app]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

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[ahuang11]

Use exllama instead of llama cpp python

[pavithraes]

Thank you!