[plan] Reorder Quick Start 'What's next?' section and make Public Preview notice more prominent on home page #43691

Objective

Reorder the "What's next?" section in Quick Start to lead with simpler follow-up steps before the 19-part blog series, and make the "Public Preview" notice more prominent on the home page.

Context

Discussion #43686 (Documentation Noob Tester report) flagged two related UX issues:

1. "What's next?" leads with a 19-part blog series — overwhelming for a brand-new user. Simpler next steps like "Creating Workflows" or "How Workflows Work" should come first.
2. "Public Preview" warning is easy to miss on the home page — appears in small text beneath the tagline, but is a significant caveat for production use.

Screenshot (home page): https://github.com/github/gh-aw/blob/assets/Documentation-Noob-Tester/d9053c0923f8bd97c565aab871a9b9a13c8f6e027b422326cf397b880dabf530.png?raw=true

Files to Modify

• docs/src/content/docs/setup/quick-start.mdx (reorder "What's next?" links)
• docs/src/content/docs/index.mdx (elevate Public Preview notice)

Acceptance Criteria

• "What's next?" in Quick Start leads with simpler follow-up steps; blog series is last
• The Public Preview notice on the home page uses a visible callout/badge that cannot be missed
• Both pages render correctly (no broken MDX/markdown)

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_{Comment /plan to run again}

• expires on Jul 7, 2026, 9:34 PM UTC-08:00