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)

astro.config.mjs

@@ -1,7 +1,10 @@
 import { defineConfig } from 'astro/config';
 import starlight from '@astrojs/starlight';
+import opengraphImages, { presets } from 'astro-opengraph-images';
+import * as fs from 'fs';
 
 export default defineConfig({
+  site: 'https://birdcage.warehack.ing',
   telemetry: false,
   devToolbar: { enabled: false },
   integrations: [
@@ -15,6 +18,9 @@ export default defineConfig({
           href: 'https://github.com/saveitforparts/Travler_Rotor',
         },
       ],
+      components: {
+        Head: './src/components/Head.astro',
+      },
       customCss: ['./src/styles/custom.css'],
       sidebar: [
         { label: 'Home', link: '/' },
@@ -57,5 +63,24 @@ export default defineConfig({
         },
       ],
     }),
+    opengraphImages({
+      options: {
+        fonts: [
+          {
+            name: 'Inter',
+            weight: 400,
+            style: 'normal',
+            data: fs.readFileSync('node_modules/@fontsource/inter/files/inter-latin-400-normal.woff'),
+          },
+          {
+            name: 'Inter',
+            weight: 700,
+            style: 'normal',
+            data: fs.readFileSync('node_modules/@fontsource/inter/files/inter-latin-700-normal.woff'),
+          },
+        ],
+      },
+      render: presets.blackAndWhite,
+    }),
   ],
 });