Fix dependabot security alert and type errors

[edwardalee]

No description provided.

[Copilot]

Pull request overview

This PR aims to address a Dependabot security alert and clean up TypeScript type errors in the Docusaurus site codebase.

Changes:

• Updates yarn.lock to introduce js-yaml@^4.1.0 (and argparse@^2.0.1) while still retaining a js-yaml@^3.13.1 resolution path.
• Updates TypeScript configuration to exclude generated src-gen output from typechecking.
• Tightens TypeScript typing in the remark placeholder replacement plugin and ref handling in the homepage slider.

Reviewed changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
yarn.lock	Adds js-yaml@4.x / argparse@2.x entries, but still includes js-yaml@3.x via transitive deps.
tsconfig.json	Excludes **/src-gen/** from TS processing.
src/remark/ReplaceTargetLanguagePlaceholder.ts	Improves plugin typing and uses mdast node types for inserted text nodes.
src/components/HomepageSlider/index.tsx	Fixes ref typing and avoids unsafe non-null assertion on current.
package.json	Removes the previous js-yaml resolution entry.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.