Add hello world to quickstart

[mintlify-development]

Summary

• Added "hello world" text to the top of the quickstart page after the frontmatter

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Note

Low Risk
Documentation-only text change with no impact on runtime behavior or data/security-sensitive logic.

Overview
Adds a Hello world line at the top of quickstart.mdx immediately after the frontmatter, introducing a brief greeting before the existing quickstart content.

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Test placeholder text in production documentation

Low Severity

The text "Hello world" appears to be test or placeholder content that doesn't belong in production documentation. This generic phrase provides no documentation value and looks out of place at the top of a quickstart guide that otherwise contains polished, professional content about deploying documentation sites.