feat: add rehype plugins for automatic heading links and update styles

[bjohansebas]

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​typescript-eslint@​8.53.1
	npm/​prettier-plugin-astro@​0.14.1
	npm/​vite-plugin-svgr@​4.5.0
	npm/​rehype-slug@​6.0.0
	npm/​rehype-autolink-headings@​7.1.0
	npm/​react@​19.2.4
	npm/​unplugin-icons@​23.0.1
	npm/​typescript@​5.9.3
	npm/​react-dom@​19.2.4

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