lists: sort list by reverse publication date

Ensures that lists and sections are sorting the blog post by publication
date, and reversely ordered. Term lists are sorted alphabetically, which
is fine.

Co-Authored-by: Igor Milhit <igor@milhit.ch>

layouts/_default/list.html

@@ -6,7 +6,7 @@
   {{.Content}}
   <article class="posts-list">
   <!-- Ranges through content/posts/*.md -->
-    {{ range .Pages }}
+    {{ range .Pages.ByPublishDate.Reverse }}
       <article class="posts-list">
         <article>
           <a href="{{ .Page.Permalink }}">{{ .Page.Title }}</a>

layouts/_default/section.html

@@ -8,7 +8,7 @@
   {{.Content }}
 </header>
 <section class="posts-list">
-  {{ range .Pages }}
+  {{ range .Pages.ByPublishDate.Reverse }}
     <article class="posts-list">
       <article>
         <a href="{{ .Permalink }}">