remove deprecated attributes

templates/default/layout.html.twig

@@ -12,7 +12,7 @@
             <header>
                 {% block header_content %}
                     <a href="https://store.steampowered.com/app/70/HalfLife/" title="{{ 'Get Half-Life' | trans }}" target="_blank">
-                        <svg version="1.1" width="20" height="20" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="364.707px" height="364.707px" viewBox="0 0 364.707 364.707" enable-background="new 0 0 364.707 364.707" xml:space="preserve">
+                        <svg version="1.1" width="20" height="20" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 364.707 364.707" enable-background="new 0 0 364.707 364.707" xml:space="preserve">
                             <path fill="currentColor" d="M223.864,272.729l-38.608-97.848l-56.603,89.184H93.166l79.052-127.654l-8.875-25.229h-30.781V81.12h52.691l60.521,153.899l26.608-8.668l8.867,29.813L223.864,272.729z"/>
                             <path fill="none" stroke="currentColor" stroke-width="34" d="M337.623,182.198c0,85.579-69.363,154.934-154.934,154.934c-85.571,0-154.936-69.354-154.936-154.934c0-85.569,69.363-154.933,154.936-154.933C268.259,27.265,337.623,96.629,337.623,182.198z"/>
                         </svg>