Streamline quickstart page

[mintlify]

Consolidated the quickstart page by removing redundant sections and streamlining content while maintaining all essential steps. This reduces the page length by approximately 60% for faster onboarding.

Files changed:

• quickstart.mdx - Removed "Before you begin" section, GitHub skip accordion, "View your deployed site" section with images, and condensed deployment instructions

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Note

Simplifies the Quickstart doc to focus on essential steps and reduce length.

• Removes Before you begin, the GitHub skip accordion, and the View your deployed site section with images from quickstart.mdx
• Consolidates deployment details into a single paragraph and refines the Tip copy
• Simplifies CLI instructions (keeps Node.js v20.17+ requirement; drops extra install/troubleshooting note)
• Minor cleanup: fixes trailing newline on closing </Columns>

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