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

layouts/_default/list.html

@@ -8,7 +8,7 @@
     <div class="post-meta">
       <time>{{ .Date.Format "Jan 2, 2006" }}</time>
       {{ if .Params.author }}
-        <span>{{ .Params.author.name }}</span>
+        <span>{{ .Params.author }}</span>
       {{ end }}
     </div>
     {{ if .Params.excerpt }}