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/non-classe/2024-10-informatique-jeux-argent-ligne/index.md

@@ -6,9 +6,10 @@ slug: "informatique-jeux-argent-ligne"
 wordpress_id: 6238
 excerpt: "L’informatique a bouleversé de nombreux secteurs, y compris celui des jeux d’argent en ligne. Grâce aux avancées technologiques,…\n"
 featured_image: "https://www.mistergeek.net/wp-content/uploads/2024/10/image-2.png"
-author: {"id":2,"name":"Expert"}
-categories: [{"id":1,"name":"Non classé","slug":"non-classe"}]
+author: "Expert"
+categories: ["Non classé"]
 tags: []
+section: "non-classe"
 ---
 
 </p>