Fix links to documentation

[samdark]

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[Copilot]

🟢 Approval recommended

The change is limited to documentation URL updates and the resulting Markdown formatting and link structure are consistent and well-formed.

Pull request overview

Updates the contributing guide to point to the hosted Yii internals documentation site instead of GitHub yiisoft/docs blob links, keeping contributor references current and easier to browse.

Changes:

• Switched prerequisite documentation links to https://yiisoft.github.io/docs/internals/....
• Updated the “special development tool” and “roadmap” references to the same hosted docs location.

File summaries

File	Description
.github/CONTRIBUTING.md	Replaces outdated GitHub blob URLs with hosted Yii internals documentation links.

Review details

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

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