✨Jx changed cookie name (ampproject#38507)

* added the jixie 3p

* changed to do a universal ad

* clean up and simplification

* delete a file added by accident

* adding the client id scope and cookie name for jixie ad network

* Update jixie.md

* Update jixie.js

* corrected some style problems e.g. relative path usage etc

* removed a space which caused linting failures

* fixing 2 other linting concerns : unused variable and space char

* updating the URL for the jixie amp ads script

* modified jixie ck name

ads/_config.js

@@ -714,7 +714,7 @@ const adConfig = jsonConfiguration({
   'jixie': {
     prefetch: ['https://scripts.jixie.media/jxamp.min.js'],
     clientIdScope: '__jxamp',
-    clientIdCookieName: '_jx',
+    clientIdCookieName: '_jxx',
     renderStartImplemented: true,
   },