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/ddl/2016-12-5-sites-ddl/index.md

@@ -6,9 +6,10 @@ slug: "5-sites-ddl"
 wordpress_id: 95
 excerpt: "Aujourd’hui, c’est l’occasion de faire la liste des sites qui peuvent remplacer Zone Téléchargement. Zone Téléchargement a été…\n"
 featured_image: "https://www.mistergeek.net/wp-content/uploads/2020/12/iu.png"
-author: {"id":1,"name":"Kevin"}
-categories: [{"id":200,"name":"DDL","slug":"ddl"}]
+author: "Kevin"
+categories: ["DDL"]
 tags: []
+section: "ddl"
 ---
 
 </p>