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/content.config.ts

@@ -11,7 +11,8 @@ const shared = {
   alt: z.string().optional(),
   lang: language,
   translationKey: z.string().optional(),
-  draft: z.boolean().default(false)
+  draft: z.boolean().default(false),
+  sections: z.array(z.record(z.unknown())).optional()
 };
 
 const pages = defineCollection({