feat: add gemini styles / remove dark mode

[shadcn]

• Adds Gemini styles
• Removes the dark mode (for demo) - we can add later.

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
gemini-chatbot	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 10, 2024 3:30pm