Remove leading whitespace from card outside CardGroup

[Copilot]

Addresses feedback on #26 regarding misleading indentation in use-cases/invoicing.mdx.

The "Build with API" card appeared indented but was outside the <CardGroup> that closes on line 92. Removed leading whitespace to clearly indicate it's a separate, full-width element.

Changes:

• Removed indentation from <Card> element starting at line 94
• Card now starts at column 1, consistent with its position outside the CardGroup

</CardGroup>

<Card 
  title="Build with API" 
  icon="code"
  href="/api-features/create-requests"
>

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[MantisClone]

no this is already fixed.