Add hello world to quickstart

[mintlify-development]

Summary

• Added "Hello world" text to the top of the quickstart.mdx page
• Simple content addition to demonstrate documentation editing workflow

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Note

Low Risk
Single documentation-only text addition with no functional or behavioral impact.

Overview
Adds a simple "Hello world" line near the top of quickstart.mdx to demonstrate a basic documentation edit.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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Test placeholder text committed to production documentation

Low Severity

The text "Hello world" appears to be demo/test content added to demonstrate a documentation editing workflow, as stated in the PR description. This placeholder text doesn't belong in a production quickstart guide and would make the documentation appear unprofessional if deployed.