Fix links to documentation

[samdark]

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[Copilot]

🟢 Approval recommended

The changes are limited to documentation link updates and the resulting markdown renders cleanly with the new URLs.

Pull request overview

Updates the contributor documentation to point to the current Yii internal documentation site, replacing direct links to Markdown files in the yiisoft/docs repository.

Changes:

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

File summaries

File	Description
.github/CONTRIBUTING.md	Refreshes documentation URLs to the yiisoft.github.io internals docs site and fixes list formatting consistency.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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