Simplify quickstart page

[mintlify]

Streamlined the quickstart guide by removing verbose sections and focusing on essential steps. Removed the "Before you begin" section, accordion, images, detailed step-by-step instructions, and reduced next steps to a single card.

Files changed:

• quickstart.mdx - Simplified content structure and removed unnecessary details

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Note

Streamlines quickstart.mdx to focus on essential setup and first edit.

• Removes frontmatter keywords, "Before you begin", accordion, images, and verbose step-by-step sections
• Replaces long instructions with concise steps under Tabs (now Web editor first, then CLI)
• Condenses deployment guidance to a single sentence with start URL and deployed domain format
• Simplifies "Next steps" to a single Card linking to custom domain setup

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