Remove beta banner

src/dgenies/static/css/style.css

 body {
     font-size: 14px;
     font-family: sans-serif;
-    padding-top: 80px;
+    padding-top: 50px;
 }
 
 #body {

src/dgenies/templates/base.html

@@ -62,7 +62,6 @@
                     </ul>
                 </div><!--/.nav-collapse -->
             </div>
-        <div class="beta-warning">This is a beta version. You may encounter some bugs. Please report them at <a href="mailto:floreal.cabanettes@inra.fr">floreal.cabanettes@inra.fr</a></div>
         </div>
 
         <div class="container theme-showcase" id="body-container" role="main">