docs: improve Calendar styling on Mail example

[shyakadavis]

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Minor styling issue; previously set the padding on the Calendar itself - terrible idea.

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P.S. I don't know why the registry files are being affected - just did pnpm dev and they "built". 🤷‍♂️

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Name	Status	Preview	Comments	Updated (UTC)
shadcn-svelte	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 26, 2024 5:23pm

[huntabyte]

Don't worry about the registry bit, we probably should add them to the .gitignore since they are built when the app is deployed anyways!

[huntabyte]

Thank you!