feat: implement screendesign

templates/base.html.twig

@@ -2,6 +2,7 @@
 <html lang="de">
     <head>
         <meta charset="UTF-8">
+        <meta name="viewport" content="width=device-width, initial-scale=1.0">
         <title>{% block title %}MyE&P.next{% endblock %}</title>
         {% block stylesheets %}
             {{ encore_entry_link_tags('app') }}