test graphics

it4i_theme/drawer.html

 <nav aria-label="Navigation">
+{% set home = repo_url | default("/", true) %}
+  <a href="{{ home }}" class="project">
+    <div class="banner">
+      {% if config.extra.logo %}
+        <div class="logo">
+          <img src="{{ base_url }}/{{ config.extra.logo }}">
+        </div>
+      {% endif %}
+    </div>
+  </a>
   <div class="scrollable"> 
         <ul class="repo">
           <li class="repo-download">