Condense quickstart page content

[mintlify-development]

Summary

• Simplified the quickstart guide to reduce reading time and cognitive load
• Condensed verbose explanations into concise bullet points
• Maintained all essential information while removing redundant text
• Reduced page length by ~75% for better user experience

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Note

Low Risk
Documentation-only rewrite that removes UI components and lengthy walkthroughs; risk is limited to potential loss/oversimplification of guidance or links.

Overview
Condenses quickstart.mdx by rewriting verbose onboarding/deployment and first-change instructions into brief numbered steps and short bullet links.

Removes component-heavy content (tabs/steps, accordions, cards, screenshots/frames, and tips) and replaces it with plain Markdown sections for deploying, making a first change via CLI or web editor, and simplified next steps.

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