Add complete Open Graph metadata layer across all 20 pages

- Add og:title, og:description, og:image, og:url, og:type, og:site_name to BaseLayout
- Add og:locale (en_GB) + og:locale:alternate (fr_FR, nb_NO) multilingual signals
- Add article:published_time, article:section, article:author on all 5 article pages
- Add Twitter/X summary_large_image card and canonical link on every page
- Generate 13 Jazz Noir branded 1200x630 PNG OG images (satori + resvg-js)
- Add scripts/generate-og-images.mjs + Special Elite font for future regeneration
- Add public/images/articles/ and public/assets/ which were previously untracked

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

public/assets/gidouille.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" fill="none" stroke="#8f2218" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round">
+  
+  <path d="M 32 18&#xA;           C 46 18 54 30 50 42&#xA;           C 47 51 36 54 28 49&#xA;           C 21 44 22 35 28 31&#xA;           C 34 28 41 32 41 38&#xA;           C 41 43 37 46 33 45&#xA;           C 30 44 29 41 31 39"></path>
+</svg>