docs: add a demo for ratatui

[grampelberg]

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Name	Status	Preview	Comments	Updated (UTC)
kty	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 18, 2024 9:25pm

[sourcery-ai]

🧙 Sourcery has finished reviewing your pull request!

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[sourcery-ai]

Hey @grampelberg - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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