docs: use Markdown for skill references

[chenjiahan]

This PR standardizes the migration skill's reference files on plain Markdown so they can be consumed without MDX handling.

It renames all .mdx references to .md and updates the internal links accordingly.

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📥 Commits

Reviewing files that changed from the base of the PR and between d3bdfb8 and 2ec0729.

📒 Files selected for processing (8)

• .agents/skills/migrate-to-rstack-cli/SKILL.md
• .agents/skills/migrate-to-rstack-cli/references/git-hooks.md
• .agents/skills/migrate-to-rstack-cli/references/lint-staged.md
• .agents/skills/migrate-to-rstack-cli/references/rsbuild.md
• .agents/skills/migrate-to-rstack-cli/references/rslib.md
• .agents/skills/migrate-to-rstack-cli/references/rslint.md
• .agents/skills/migrate-to-rstack-cli/references/rspress.md
• .agents/skills/migrate-to-rstack-cli/references/rstest.md

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