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/2023-09-comparatif-operateur-reunion/index.md

@@ -6,9 +6,10 @@ slug: "comparatif-operateur-reunion"
 wordpress_id: 6007
 excerpt: "Bienvenue sur cet article dédié à la sélection d’un opérateur Internet à la Réunion, pour vos informer ou…\n"
 featured_image: "https://www.mistergeek.net/wp-content/uploads/2024/02/meilleur-operateur-internet-reunion.png"
-author: {"id":2,"name":"Expert"}
-categories: [{"id":14,"name":"Informatique","slug":"informatique"}]
+author: "Expert"
+categories: ["Informatique"]
 tags: []
+section: "informatique"
 ---
 
 </p>