Fix links to documentation

[samdark]

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[Copilot]

🟢 Approval recommended

The change is a straightforward documentation link update with only a minor wording nit noted.

Pull request overview

Updates the contributor documentation to point at the current Yii internal docs site (GitHub Pages) instead of the old yiisoft/docs repository paths, keeping onboarding instructions accurate.

Changes:

• Replaced legacy github.com/yiisoft/docs/blob/master/*.md links with https://yiisoft.github.io/docs/internals/* links.
• Updated the “special development tool” link to the new docs location.
• Updated the roadmap link to the new docs location.

File summaries

File	Description
.github/CONTRIBUTING.md	Refreshes documentation links to the current published docs site for prerequisites, dev tool, and roadmap references.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

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