Fix links to documentation

[samdark]

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[Copilot]

🟡 Changes recommended

Several updated documentation URLs likely need the .html suffix to reliably resolve on the published docs site.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR updates the contributor documentation to point to the new Yii internals documentation site instead of GitHub yiisoft/docs blob links.

Changes:

• Replaced github.com/yiisoft/docs/blob/master/*.md links with yiisoft.github.io/docs/internals/* links.
• Normalized list formatting/indentation in the prerequisites section.
• Updated the “development tool” and “roadmap” references to the new docs host.

File summaries

File	Description
.github/CONTRIBUTING.md	Updates contributor-facing documentation links to the new Yii docs site.

Review details

Suppressed comments (2)

.github/CONTRIBUTING.md:21

• This roadmap link likely needs the .html suffix to match the published internals docs URL format (e.g., .../003-roadmap.html).

- [Check roadmap](https://yiisoft.github.io/docs/internals/003-roadmap).

.github/CONTRIBUTING.md:11

• This link likely needs the .html suffix to match the published internals docs URL format (e.g., .../005-development-tool.html).

Since Yii 3 consists of many packages, we have a [special development tool](https://yiisoft.github.io/docs/internals/005-development-tool).

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

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