Consolidate quickstart page

[mintlify]

Removed unnecessary words throughout the quickstart page to make it more concise while maintaining clarity and all essential information. This improves readability and reduces cognitive load for users getting started with Mintlify.

Files changed

• quickstart.mdx

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Note

Low Risk
Documentation-only wording changes with no behavioral or configuration impact.

Overview
Refactors quickstart.mdx to be more concise by removing redundant phrasing and tightening instructions across onboarding/deploy, viewing the deployed site, and making the first change (CLI and web editor).

No flow or links are changed; this is a copy-only readability pass (e.g., shorter onboarding guidance, simplified optional GitHub-skip accordion, and streamlined deployment-status/custom-domain notes).

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