Fix related external posts (alshedivat#2980)

Fixes alshedivat#2977

Signed-off-by: George Araújo <[email protected]>

Author: george-gca

_includes/related_posts.liquid

@@ -13,7 +13,16 @@
   {% endunless %}
 
   <li class="my-2">
-    <a class="text-pink-700 underline font-semibold hover:text-pink-800" href="{{ site.baseurl }}{{ post.url }}">{{ post.title }}</a>
+    {% if post.redirect == blank %}
+      <a class="text-pink-700 underline font-semibold hover:text-pink-800" href="{{ post.url | relative_url }}">{{ post.title }}</a>
+    {% elsif post.redirect contains '://' %}
+      <a class="text-pink-700 underline font-semibold hover:text-pink-800" href="{{ post.redirect }}" target="_blank">{{ post.title }}</a>
+      <svg width="1rem" height="1rem" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg">
+        <path d="M17 13.5v6H5v-12h6m3-3h6v6m0-6-9 9" class="icon_svg-stroke" stroke="#999" stroke-width="1.5" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"></path>
+      </svg>
+    {% else %}
+      <a class="text-pink-700 underline font-semibold hover:text-pink-800" href="{{ post.redirect | relative_url }}">{{ post.title }}</a>
+    {% endif %}
   </li>
 {% endfor %}
 {% if site.newsletter.enabled and site.footer_fixed %}