accessibility: remove zoom restriction

Author: Felix Hennig

template/layout.html

@@ -7,7 +7,7 @@
     <link rel="icon" type="image/png" href="/static/favicon.ico?v=1" />
 
     <meta charset="utf-8" />
-    <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport" />
+    <meta content="width=device-width, initial-scale=1.0" name="viewport" />
     <meta name="viewport" content="width=device-width, initial-scale=1">
 
     <link rel="stylesheet" href="/static/css/root.css">