Fix blog overview arrows

Author: derdilla

templates/blog.html

@@ -19,7 +19,7 @@ <h2>{{ post.title }}</h2>
       </header>
       <p>{{ post.description }}</p>
       <a href="{{ post.permalink | safe }}" class="layout-link-button"><span style="padding-right: 8px">Open</span><img
-          alt="Open post" src="assets/btn-progress.svg" width="12px"></a>
+          alt="Open post" src="/assets/btn-progress.svg" width="12px"></a>
     </article>
     {% endfor %}
   </section>