fix: invert the buttons on the button navigation of an article (#2)

Reviewed-on: #2

src/_layouts/article.njk

@@ -28,15 +28,15 @@ templateClass: tmpl-post
   {%- if nextArticle or previousArticle %}
     <nav class="post-nav">
       <ul>
-        {%- if previousArticle %}<li class="previous">
-          <a href="{{ previousArticle.url }}" title="Article précédent">
-            <span class="icon" aria-hidden="true">«</span>
-            <span>{{ previousArticle.data.title }}</span>
-          </a>
-          </li>{% endif %}
         {%- if nextArticle %}<li class="next">
           <a href="{{ nextArticle.url }}" title="Article suivant">
+            <span class="icon" aria-hidden="true">«</span>
             <span>{{ nextArticle.data.title }}</span>
+          </a>
+          </li>{% endif %}
+        {%- if previousArticle %}<li class="previous">
+          <a href="{{ previousArticle.url }}" title="Article précédent">
+            <span>{{ previousArticle.data.title }}</span>
             <span class="icon" aria-hidden="true">»</span>
           </a>
           </li>{% endif %}