Fix gallery shortcode

docs/templates/shortcodes/gallery.html

@@ -1,8 +1,8 @@
-{% for asset in page.assets %}
-  {% if asset is ending_with(".jpg") %}
-    <a href="{{ get_url(path=asset) }}">
-      <img src="{{ resize_image(path=asset, width=240, height=180, op="fill") }}" />
+{% for asset in page.assets -%}
+  {%- if asset is ending_with(".jpg") -%}
+    <a href="{{ get_url(path=asset) | safe }}">
+      <img src="{{ resize_image(path=asset, width=240, height=180, op="fill") | safe }}" />
     </a>
     &ensp;
-  {% endif %}
-{% endfor %}
+  {%- endif %}
+{%- endfor %}