Fix ordering of conditionals to allow both single page site mode and normal blog mode. Add semantic tags

layouts/_default/list.html

@@ -6,7 +6,7 @@
   {{ end }}
   <div class="posts">
     {{ range .Pages }}
-      <div class="post on-list">
+      <article class="post on-list">
         <h1 class="post-title">
           <a href="{{ .Permalink }}">{{ .Title | markdownify }}</a>
         </h1>
@@ -55,7 +55,7 @@
             href="{{.RelPermalink}}">{{ $.Site.Params.ReadMore }} →</a>
         </div>
         {{ end }}
-      </div>
+      </article>
     {{ end }}
     {{ partial "pagination.html" . }}
   </div>