Rewrite quickstart page

[handotdev]

Documentation changes

Completely rewrites the Quickstart page (quickstart.mdx) to improve clarity, user experience, and overall flow.

The rewrite focuses on:

• Outcome-focused language: Guiding users to get their docs live in 10 minutes.
• Enhanced user experience: Introducing visual cards, tabs for workflow choice (Code Editor vs. Web Editor), and clear verification steps.
• Improved component usage: Strategic use of Steps, CardGroup, Tabs, Check, Tip, and Info components.
• Better structure: Progressive disclosure from basic setup to advanced customization (custom domain, next steps).
• Streamlined troubleshooting: More actionable and organized troubleshooting section.

Closes

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

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Slack Thread

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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