feat: astro built-ins — news pagination, prefetch, RSS, OG/SEO meta, TOC scrollspy (Starlight-pattern)

astro.config.mjs

@@ -3,6 +3,14 @@ import { defineConfig } from 'astro/config';
 // Static output (zero runtime) — the whole point of the git-based approach.
 export default defineConfig({
   output: 'static',
+  // Placeholder domain until the real one exists — only used to build absolute
+  // URLs (canonical, og:*, RSS, sitemap). Swap once the portal has a home.
+  site: 'https://portal.ctao.org',
+  // Built-in prefetch on every internal link (no per-link attributes needed).
+  // Default 'hover' strategy: near-instant navigation without the bandwidth
+  // cost of 'viewport' on a 24-card grid; auto-falls back to 'tap' on
+  // data-saver / slow connections (Astro handles that).
+  prefetch: { prefetchAll: true },
   redirects: { '/telescopes': '/proposals' },
   server: { port: 4321, host: true },
   vite: {