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/jeu-video/2017-05-resident-evil-7/index.md

@@ -6,9 +6,10 @@ slug: "resident-evil-7"
 wordpress_id: 149
 excerpt: "Resident Evil 7 (Biohazard) – pour ceux qui ont dans le ventre ! Il n’y a aucune limite…\n"
 featured_image: "https://www.mistergeek.net/wp-content/uploads/2017/05/resident-evil-7.jpg"
-author: {"id":2,"name":"Expert"}
-categories: [{"id":5,"name":"Jeu vidéo","slug":"jeu-video"}]
+author: "Expert"
+categories: ["Jeu vidéo"]
 tags: []
+section: "jeu-video"
 ---
 
 </p>