refactor(home): move page content into per-language YAML sections

All visible text, lists, image refs, and CTAs for the home page now live
in en/index.md and es/index.md as a typed `sections:` frontmatter array.
HomePage.astro is reduced to a thin router; each section type is rendered
by a dedicated component in src/components/home/. Adds .no-balance utility
class to suppress text-wrap: balance on the commitments heading.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

www/src/styles/typography.css

@@ -4,6 +4,7 @@
 @font-face { font-family: Rubik; src: url('/assets/fonts/Rubik/700.woff2') format('woff2'); font-weight: 700; font-display: swap; }
 body { color: var(--color-text); font-family: var(--font-body); font-size: 16px; line-height: 1.625; }
 h1, h2, h3 { color: var(--color-primary); font-family: var(--font-heading); line-height: 1.15; text-wrap: balance; }
+.no-balance { text-wrap: auto; }
 h1 { font-size: clamp(2.5rem, 5vw, 3rem); line-height: 1.12; margin: 0 0 var(--space-md); }
 h2 { font-size: clamp(2rem, 4vw, 2.4rem); line-height: 1.25; }
 h3 { font-size: 1.5rem; }