docs(start): update nitro v3 instructions for nitro alpha package

[dotnize]

Nitro v3 Alpha was just recently published, and now under the nitro npm package.

Summary by CodeRabbit

• Documentation
  • Updated hosting guides to reflect Nitro v3 ALPHA status instead of BETA.
  • Removed nightly installation instructions and references to nitro-nightly.
  • Revised examples to import from nitro and nitro/vite, with updated plugin invocation syntax.
  • Adjusted section headings and code snippets to match ALPHA guidance.
  • Applied changes across React and Solid framework guides for consistency.

[coderabbitai]

Walkthrough

The React and Solid hosting guides were updated to reflect Nitro v3 ALPHA: references changed from nitro-nightly/BETA to nitro/ALPHA, import paths adjusted to nitro/vite, and plugin invocation examples updated to nitro(...) with the new preset configuration. Removed prior BETA notes and nightly install instructions.

Changes

Cohort / File(s)	Summary of Changes
React hosting docs (Nitro v3 ALPHA update) docs/start/framework/react/guide/hosting.md	Replaced Nitro v3 BETA references with ALPHA; removed nitro-nightly install snippet and BETA note; updated examples to import from nitro/vite and use nitro(...) with revised preset usage.
Solid hosting docs (Nitro v3 ALPHA update) docs/start/framework/solid/guide/hosting.md	Mirrored updates: BETA → ALPHA, nitro-nightly → nitro, import path to nitro/vite, plugin invocation via nitro(...), and updated preset configuration in examples.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• fix: nitro v3 plugin link in the hosting docs #5253 — Similar update to React hosting docs modifying the Nitro v3 plugin reference/package path.
• Docs: Change "target" to "preset" in Nitro example config #5290 — Documentation/example changes aligning plugin import/usage and renaming config from target to preset.

Suggested labels

documentation

Poem

I thump my paw—an ALPHA cheer,
From nightly burrows to cleaner gear.
Nitro now, not beta’s plight,
Vite paths tidy, presets right.
In docs I hop, with syntax bright—
Shipping carrots, code in sight. 🥕✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The title clearly identifies the primary change as updating the Nitro v3 documentation to reference the new nitro alpha package, concisely conveys the scope and nature of the update, and aligns with the Conventional Commits style without including extraneous details.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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