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/telechargement/2018-10-contourner-blocage/index.md

@@ -6,9 +6,10 @@ slug: "contourner-blocage"
 wordpress_id: 347
 excerpt: "Vous pensez que votre site subit un blocage ? Faut-il s’en inquiéter ? Il y a-t-il un problème…\n"
 featured_image: "https://www.mistergeek.net/wp-content/uploads/2018/10/Blocage-DNS.jpg"
-author: {"id":1,"name":"Kevin"}
-categories: [{"id":8,"name":"Téléchargement","slug":"telechargement"}]
+author: "Kevin"
+categories: ["Téléchargement"]
 tags: []
+section: "telechargement"
 ---
 
 </p>