Simplify quickstart page

[mintlify]

Streamlined the quickstart guide by removing verbose explanations and focusing on essential deployment steps. Reduced page length by ~50% while maintaining all critical information for getting started.

Files changed:

• quickstart.mdx - Simplified content, removed accordion, screenshot, and extra context

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Note

Overview
Simplifies quickstart.mdx to focus on essential deployment and first-change steps, reducing length and removing ancillary guidance.

• Rewrites intro and deployment section with concise steps; site URL and dashboard reference kept
• Prioritizes the Web editor tab; adds brief Publish step
• Trims CLI tab to minimal install (npm i -g mint) and basic dev/commit/push flow
• Removes verbose onboarding details, accordion, screenshots, tips, and extra preview/publish instructions
• Streamlines "Next steps" to two cards (editor and custom domain) with shorter copy

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