Fix the security policy issue with the new analytics script (#1809)

* HelmetCsp: fix connectSrc for analytics script

* Fix linter issue

Author: xbpcb

config/helmet-csp.js

@@ -62,7 +62,8 @@ const CSP = {
     connectSrc: [
         'syndication.twitter.com',
         'https://api.github.com/repos/jsdelivr/bootstrapcdn',
-        'https://stats.g.doubleclick.net'
+        'https://stats.g.doubleclick.net',
+        'https://datum.jsdelivr.com/api/event'
     ],
     objectSrc: ['img.shields.io'],
     manifestSrc: ['\'self\'']