Document the DOMStack starter with manual setup as an alternative

[bcomnes]

Summary

• Lead the installation guide with npm create @domstack/app@latest my-app.
• Document development, production build, preview, and the interactive starter choices.
• Keep the existing manual installation and first-page instructions as an explicit alternative.
• Link both paths from the documentation index.

Validation

• git diff --check passed.
• Markdown rendering and checks for section anchors and starter/manual commands passed.
• Commands and generated scripts were cross-checked against the starter documentation/source.
• Registry verification is pending: npm returned E404 for @domstack/create-app@0.0.1 and the latest starter help command from this environment, despite the reported publication. Please confirm public registry availability before merging.

Documentation-only change; no runtime code changed.

[coveralls]

Coverage Report for CI Build 35460906671

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Build has drifted: This PR's base is out of sync with its target branch, so coverage data may include unrelated changes.
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Coverage: 97.208%

Details

• Patch coverage: No coverable lines changed in this PR.

Uncovered Changes

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Coverage Regressions

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Coverage Stats

Relevant Lines:	11463
Covered Lines:	11263
Line Coverage:	98.26%
Relevant Branches:	4084
Covered Branches:	3850
Branch Coverage:	94.27%
Branches in Coverage %:	Yes
Coverage Strength:	942.56 hits per line

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💛 - Coveralls