[feat] Starship Demo Mode (beta)

[triathematician]

Add "Starship Demo" mode with:

• [x] Button on toolbar to launch
• [x] Structured pipeline for question, response, and rewriting
  • [x] Configurable random question generator
  • [x] RAG response based on document Q&A mode
  • [x] Secondary prompt/response highlighted - based on Q&A response
  • [x] Tertiary prompt/responses - any number based on Q&A response
• [x] Visual interest
  • [x] Layout shows question, relevant documents, and prompt responses animating over time
  • [x] Each prompt response has icon and title
  • [x] Option for rotating through template parameters for specific prompts
  • [x] Background icon set for "whimsy"
  • [x] Overlay showing explanation of each of the different RAG and prompting steps (enable/disable with x key)
• [x] Configuration file allowing for customization