Update conversion tracking docs for direct sale events

[mintlify[bot]]

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

---

Created by Mintlify writer

[coderabbitai[bot]]

[!IMPORTANT]

Review skipped

Bot user detected.

To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}