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/variables.css

@@ -6,7 +6,7 @@
   --color-accent-strong: #ff914d;
   --color-background: #ffffff;
   --color-surface: #ffffff;
-  --color-tint: #fefaf2;
+  --color-tint: #fbf2e1;
   --color-text: #254080;
   --color-muted: #254080;
   --color-border: #edeef3;