DRY up archive include

- Combine grid and list view into one include

_pages/portfolio-archive.html

@@ -5,12 +5,12 @@ permalink: /portfolio/
 ---
 
 {% include base_path %}
-{% include group-by-array collection=site.portfolio field='categories' %}
+{% include group-by-array collection=site.portfolio field="categories" %}
 
 {% for category in group_names %}
   {% assign posts = group_items[forloop.index0] %}
   <h2 id="{{ category | slugify }}" class="archive__subtitle">{{ category }}</h2>
   {% for post in posts %}
-    {% include archive-list-single.html %}
+    {% include archive-single.html %}
   {% endfor %}
 {% endfor %}