feat: markdown documentation PoC

[ppvg]

Convert some of the Button documentation pages to markdown as a Proof of Concept.

• Uses mdsvex to render markdown routes.
• Uses frontmatter:
  • title property for page titles.
  • breadcrumb property for breadcrumb names (defaults to title if omitted).
  • nav property for optional sidemenu (list of links).
• Applies syntax highlighting to markdown code blocks.
• Automatically prepends {base} to absolute link URLs.

[reinschaap]

Wat awesome, ik zag 2 mini dingetjes.

Echt tof opgezet zo en ik denk dat dit enorm werkbaar is!!! 👍👍💪💪🙏🙏

[reinschaap]

Local gerunt, werkt TOP @ppvg hele goede verbetering

[randh1r]

LGTM