feat(stories): add new docs dependencies

[natemoo-re]

Adds new features to our MDX-powered design system documentation.

package	reason
remark-frontmatter, remark-mdx-frontmatter	add support for yaml frontmatter and exported frontmatter variable in mdx files
remark-gfm	add github-flavored markdown support (tables, etc)
@r4ai/remark-callout	obsidian-styled callout support (eg > [!WARNING])
rehype-expressive-code	enhanced auto-highlighted code blocks with annotations via expressive-code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

Additional details and impacted files

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##             ui2/nm/docs-new   #94006   +/-   ##
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