docs: add projects guide

[9aoy]

Summary

add projects guide.

Related Links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull request overview

This PR adds comprehensive documentation for the projects feature in Rstest, reorganizing content from the config reference into a dedicated guide. The documentation explains how to configure and use multiple test projects within a single Rstest process, which is particularly useful for monorepos and multi-environment testing scenarios.

Key changes:

• New guide files added for multi-project testing in both English and Chinese
• Content migrated from config documentation to guide with expanded explanations
• Minor documentation corrections to debugging references

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
website/docs/zh/guide/basic/projects.mdx	New Chinese guide explaining multi-project testing with configuration examples and use cases
website/docs/en/guide/basic/projects.mdx	New English guide explaining multi-project testing with configuration examples and use cases
website/docs/zh/guide/basic/_meta.json	Updated navigation to include the new projects guide
website/docs/en/guide/basic/_meta.json	Updated navigation to include the new projects guide
website/docs/zh/guide/advanced/debugging.mdx	Corrected reference from "构建" (build) to "测试" (test) for clarity
website/docs/en/guide/advanced/debugging.mdx	Corrected reference from "building" to "testing" for clarity
website/docs/zh/config/test/projects.mdx	Removed detailed configuration notes, now referenced in the new guide
website/docs/en/config/test/projects.mdx	Removed detailed configuration notes, now referenced in the new guide

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