Add support for the neighbors plugin (#98)

templates/article.html

@@ -57,6 +57,8 @@
   </div>
   {% endif %}
 
+  {% include "partial/neighbors.html" %}
+
   {% if article.related_posts %}
   <div class="related-posts">
     <h4>{{ _('You might enjoy') }}</h4>

templates/partial/neighbors.html

@@ -0,0 +1,14 @@
+{% if 'neighbors' in PLUGINS %}
+  <div class="neighbors">
+  {% if article.prev_article %}
+    <a class="btn float-left" href="{{ SITEURL }}/{{ article.prev_article.url }}" title="{{ article.prev_article.title }}">
+      <i class="fa fa-angle-left"></i> {{ _('Previous Post') }}
+    </a>
+  {% endif %}
+  {% if article.next_article %}
+    <a class="btn float-right" href="{{ SITEURL }}/{{ article.next_article.url }}" title="{{ article.next_article.title }}">
+      {{ _('Next Post') }} <i class="fa fa-angle-right"></i>
+    </a>
+  {% endif %}
+  </div>
+{% endif %}