Update main.py

Update Gemini model version in send_to_gemini function to enhance performance and align with latest features.

Update Gemini model version in send_to_gemini function to improve performance and capabilities.

Remove bubble_full_width property from Chatbot component and simplify demo launch parameters in main.py.

Update README.md to enhance project description, features, installation instructions, and usage guidelines; change main application file reference from app.py to main.py and update emoji.

initial commit