display know more for visitors

src/Muzich/CoreBundle/Resources/public/css/main.css

   
 #know_more
 {
-  float: left;
-  margin-left: -11px;
-  margin-top: -67px;
+  float: none;
+  margin-bottom: 16px;
+  margin-top: 0;
 }
 
 div.helpbox_image_container

src/Muzich/CoreBundle/Resources/views/Layout/side.html.twig

 
 {% else %}
   <div class="side_margin_top"></div>
+  
+  <div class="center">
+    <a id="know_more" class="helpbox button" href="{{ path('helpbox_bootstrap', {'ressource_id':'know_more'}) }}" title="{{ 'help.know_more'|trans({}, 'navigationui') }}">
+      {{ 'help.know_more'|trans({}, 'navigationui') }}
+    </a>
+  </div>
+  
 {% endif %}
 
   <div id="searchbox" class="nicebox">