Simplify quickstart page

[mintlify]

Reduced quickstart page content by 70% to focus on essential deployment and editing steps. Removed verbose explanations, images, and extra navigation cards.

Files changed:

• quickstart.mdx - Streamlined content to core deployment and first change instructions

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Note

Focuses the quickstart on essential actions and removes ancillary content.

• Rewrites quickstart.mdx to a concise flow: simple deploy instructions and two short step lists for Web editor and CLI
• Removes verbose explanations, images/frames, tooltips, accordions, and multi-card "Next steps"; keeps a single custom domain card
• Drops unused frontmatter keywords metadata

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