- about.astro: change .values-grid from 4 columns to 2x2 (max-width 900px)
for visual balance with 4 cards. Drop the duplicate 2-col breakpoint
that became redundant after the desktop change.
- about.astro: switch from deprecated entry.render() to render(entry)
to match Astro v6 content collection API.
- content.config.ts: pages collection glob pattern '**/*.{md,mdx}'
silently matched zero files when the collection only had root-level
files; switch to '*.{md,mdx}' so the loader actually picks up
about.md and home.md.