Move annotatorjs to the bottom of the body

So that the "article" tag is loaded before

src/Wallabag/CommentBundle/DependencyInjection/WallabagCommentExtension.php

@@ -3,9 +3,7 @@
 namespace Wallabag\CommentBundle\DependencyInjection;
 
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\Config\FileLocator;
 use Symfony\Component\HttpKernel\DependencyInjection\Extension;
-use Symfony\Component\DependencyInjection\Loader;
 
 class WallabagCommentExtension extends Extension
 {