adjust content security policy; add missing div closure

src/index.html

@@ -5,8 +5,7 @@
     <link href="${require('./index.scss')}" rel="stylesheet">
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1">
-    <meta http-equiv="Content-Security-Policy"
-        content="default-src 'none'; font-src 'self'; img-src 'self'; style-src 'self';">
+    <meta http-equiv="Content-Security-Policy" content="default-src 'self'">
     <title>about amphineko</title>
 </head>
 
@@ -195,6 +194,7 @@
                 Copyright © 2015-2019 amphineko. Illustrations have their own licenses.
             </div>
         </div>
+    </div>
 </body>
 
 </html>