make listings a template

src/index.njk

@@ -25,19 +25,7 @@ title: Fediverse Skillshare Classifieds
       <p>No listings.</p>
       {% endif %}
       {% for listing in collections[tag] %}
-        <div class="listing{% if listing.data.draft %} draft{% endif %}">
-          <h3>{{ listing.data.title }}</h3>
-          <p class="blurb">
-            <strong>
-              <a href="https://{{ listing.data.url }}"
-              target="_blank">{{ listing.data.handle }}</a>
-            offers:</strong> {{ listing.data.blurb }}
-          </p>
-          <p class="listed-on">
-            listed on <time datetime="{{ listing.date | htmlDateString }}"
-              >{{ listing.date | readableDate() }}</time>
-          </p>
-        </div>
+        {% include "listing.njk" %}
       {% endfor %}
     </div>
   {% endfor %}