Add OG images, sitemap, and fix Dashboard description

- astro-opengraph-images: auto-generates 1200x630 PNG for all 50 pages
- Starlight Head override injects og:image via getImagePath helper
- site URL enables sitemap-index.xml generation
- Fix F1 Dashboard description (action cards, not satellite list)

package.json

@@ -12,6 +12,12 @@
   "dependencies": {
     "@astrojs/starlight": "^0.37.6",
     "astro": "^5.17.2",
+    "astro-opengraph-images": "^1.14.3",
+    "astro-seo-meta": "^5.2.0",
     "sharp": "^0.34.5"
+  },
+  "devDependencies": {
+    "@fontsource/inter": "^5.2.8",
+    "react": "^19.2.4"
   }
 }