refactor: update content structure and layout templates

- Updated author format in content files
- Added section field to content files
- Simplified categories format
- Removed no-category.html layout
- Updated list.html and single.html layouts
- Updated index.html layout
- Updated generate-content.js script
- Do not index content with git

content/informatique/2022-12-choisir-plateforme-pari/index.md

@@ -6,9 +6,10 @@ slug: "choisir-plateforme-pari"
 wordpress_id: 5293
 excerpt: "Les plateformes de paris en ligne ne sont plus une nouveauté sur internet tant leurs succès est retentissant…\n"
 featured_image: "https://www.mistergeek.net/wp-content/uploads/2022/12/pari-en-ligne-scaled.jpg"
-author: {"id":2,"name":"Expert"}
-categories: [{"id":14,"name":"Informatique","slug":"informatique"}]
+author: "Expert"
+categories: ["Informatique"]
 tags: []
+section: "informatique"
 ---
 
 </p>