Fix external links in further

templates/shortcodes/further.html

@@ -2,10 +2,15 @@
   <h2>{{title|default(value="Weiteres zu diesem Thema")}}</h2>
   <div class="columns is-multiline is-same-height">
     {% for further in page.extra.further[category] %}
+      {% if further.link is matching("^[^:/]+://") -%}
+        {% set link = further.link -%}
+      {% else -%}
+        {% set link = get_url(path=further.link) -%}
+      {% endif -%}
       <div class="column is-one-third">
         <div class="card">
           <div class="card-image">
-            <a href="{{ get_url(path=further.link)}}">
+            <a href="{{ link }}">
               <figure class="image is-4by3">
                 {% set image = resize_image(path="@/" ~ page.colocated_path ~ "/" ~ further.image, width=800, height=600) -%}
                 <img src="{{image.url}}" alt="{{further.alt}}" />
@@ -16,7 +21,7 @@
             </a>
           </div>
           <div class="card-content">
-          <p class="title"><a href="{{get_url(path=further.link)}}">{{further.title}}</a></p>
+          <p class="title"><a href="{{ link }}">{{further.title}}</a></p>
             <p class="content">
               {{further.description}}
             </p>