Update conversion tracking docs for direct sale events

[mintlify]

Added documentation for the new direct sale tracking feature that allows tracking sale events directly from clicks without requiring a preceding lead event. This is particularly useful for one-time purchases and e-commerce use cases where there's no signup/lead event.

Files changed

• conversions/quickstart.mdx - Added section explaining both traditional and direct sale tracking flows
• conversions/sales/introduction.mdx - Added comprehensive documentation for direct sale tracking with code examples and use cases

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Created by Mintlify writer

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