Simplify quickstart guide

[handotdev]

Streamlined the quickstart page by removing verbose explanations and consolidating workflows into essential steps. The page now focuses on getting users up and running quickly with minimal friction.

Files changed:

• quickstart.mdx - Condensed content from ~400 lines to ~80 lines, removed detailed explanations, images, and troubleshooting section

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Note

Condenses quickstart.mdx into a shorter, step-focused guide with streamlined deploy/setup, two concise editing workflows, simplified custom domain setup, and a compact Next steps section.

• Docs (quickstart.mdx):
  • Overhaul: Condenses and restructures the quickstart into a concise, step-focused guide.
  • Deploy & Setup: Simplifies site deployment explanation and GitHub App installation steps.
  • Editing Workflows: Consolidates into two paths—Code-based (install mint, mint new, mint dev, push) and Web editor (edit index.mdx, publish).
  • Custom Domain: Replaces verbose instructions with a minimal DNS table for CNAME setup.
  • Cleanup: Removes images, verbose explanations, and troubleshooting; adds a compact CardGroup for next steps.

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