add gatsby plugin for google analytics for main developer.cloudlfare.com folder (cloudflare#2460)

Co-authored-by: ganchimeg <[email protected]>

Author: gganch

developers.cloudflare.com/.eslintignore

@@ -0,0 +1 @@
+!../products/**/*.js 

developers.cloudflare.com/gatsby-config.js

@@ -152,6 +152,14 @@ module.exports = {
         icon: "src/images/cloudflare-icon.png"
       }
     },
+    {
+      resolve: "gatsby-plugin-google-tagmanager",
+      options: {
+        id: "GTM-PKQFGQB",
+        dataLayerName: "cfDataLayer",
+        selfHostedOrigin: "https://tr.www.cloudflare.com"
+      },
+    },
     // Consider enabling for PWA + offline functionality
     // https://gatsby.dev/offline
     // 'gatsby-plugin-offline',

developers.cloudflare.com/package.json

@@ -18,6 +18,7 @@
     "gatsby": "^2.32.12",
     "gatsby-image": "2.4.13",
     "gatsby-plugin-compile-es6-packages": "^2.1.0",
+    "gatsby-plugin-google-tagmanager": "^2.3.10",
     "gatsby-plugin-layout": "1.3.10",
     "gatsby-plugin-manifest": "2.4.18",
     "gatsby-plugin-material-ui": "2.1.9",