Fix Security meta tag

Author: emp0ry

docs/index.html

@@ -29,7 +29,6 @@
         font-src 'self' https://fonts.gstatic.com;
         img-src 'self' https://github.githubassets.com;
         connect-src 'self' https://www.google-analytics.com;
-        frame-ancestors 'self';
         upgrade-insecure-requests;
     ">