fix: add Google Analytics regional domains to CSP connect-src (#109)

Google Analytics uses regional subdomains (e.g. region1.google-analytics.com)
for data collection. Add wildcard and googletagmanager.com to connect-src.

Author: carlesarnal

_includes/head.html

@@ -9,7 +9,7 @@
   <meta http-equiv="Referrer-Policy" content="no-referrer, strict-origin-when-cross-origin">
 
   <meta http-equiv='Content-Security-Policy'
-  content="default-src https://www.youtube.com https://www.google-analytics.com; style-src 'self' https://cdnjs.cloudflare.com; img-src 'self' https://static.jboss.org https://www.google-analytics.com; font-src 'self' https://cdnjs.cloudflare.com; script-src 'self' https://maxcdn.bootstrapcdn.com https://www.google-analytics.com https://cdnjs.cloudflare.com https://www.apicurio.io https://www.googletagmanager.com https://apicurio-support-chat.onrender.com; connect-src 'self' https://www.google-analytics.com https://apicurio-support-chat.onrender.com; frame-ancestors 'none'; base-uri 'none'; form-action 'none';">
+  content="default-src https://www.youtube.com https://www.google-analytics.com; style-src 'self' https://cdnjs.cloudflare.com; img-src 'self' https://static.jboss.org https://www.google-analytics.com; font-src 'self' https://cdnjs.cloudflare.com; script-src 'self' https://maxcdn.bootstrapcdn.com https://www.google-analytics.com https://cdnjs.cloudflare.com https://www.apicurio.io https://www.googletagmanager.com https://apicurio-support-chat.onrender.com; connect-src 'self' https://www.google-analytics.com https://*.google-analytics.com https://www.googletagmanager.com https://apicurio-support-chat.onrender.com; frame-ancestors 'none'; base-uri 'none'; form-action 'none';">
 
   <link rel="shortcut icon" href="{{ site.baseurl }}/images/favicon.ico" type="image/x-icon" integrity="sha384-if9KH+NQ2dMhdrWu+INnJTcvG6riRakUAnbhecX5a7voubrapo7ouFGS+GYZ/N4P" crossorigin="anonymous"/>