feat: Upgrade to Gatsby v3

package.json

@@ -3,34 +3,34 @@
   "private": true,
   "version": "1.42.1",
   "dependencies": {
-    "@emotion/core": "^10.1.1",
-    "@emotion/styled": "^10.0.27",
+    "@emotion/react": "^11.1.5",
+    "@emotion/styled": "^11.3.0",
     "@mdx-js/mdx": "^1.6.19",
     "@mdx-js/react": "^1.6.19",
-    "@newrelic/gatsby-theme-newrelic": "^1.38.0",
+    "@newrelic/gatsby-theme-newrelic": "^2.0.0",
     "@splitsoftware/splitio-react": "^1.2.0",
     "@xstate/react": "^1.0.2",
     "classnames": "^2.2.6",
     "date-fns": "^2.16.1",
     "diff": "^4.0.2",
-    "gatsby": "^2.32.9",
+    "gatsby": "^3.3.1",
     "gatsby-image": "^2.4.20",
-    "gatsby-plugin-emotion": "^4.3.14",
-    "gatsby-plugin-manifest": "^2.4.35",
+    "gatsby-plugin-emotion": "^6.3.0",
+    "gatsby-plugin-manifest": "^3.3.0",
     "gatsby-plugin-mdx": "^1.4.0",
     "gatsby-plugin-meta-redirect": "^1.1.1",
     "gatsby-plugin-offline": "^3.2.32",
-    "gatsby-plugin-react-helmet": "^3.3.12",
+    "gatsby-plugin-react-helmet": "^4.3.0",
     "gatsby-plugin-robots-txt": "^1.5.3",
-    "gatsby-plugin-sass": "^2.3.22",
-    "gatsby-plugin-sharp": "^2.6.43",
-    "gatsby-plugin-sitemap": "^2.4.17",
-    "gatsby-plugin-use-dark-mode": "^1.2.0",
+    "gatsby-plugin-sass": "^4.3.0",
+    "gatsby-plugin-sharp": "^3.3.1",
+    "gatsby-plugin-sitemap": "^3.3.0",
+    "gatsby-plugin-use-dark-mode": "^1.3.0",
     "gatsby-remark-autolink-headers": "^2.9.0",
-    "gatsby-remark-images": "^3.5.1",
-    "gatsby-source-filesystem": "^2.3.35",
-    "gatsby-transformer-remark": "^2.8.47",
-    "gatsby-transformer-sharp": "^2.5.20",
+    "gatsby-remark-images": "^5.0.0",
+    "gatsby-source-filesystem": "^3.3.0",
+    "gatsby-transformer-remark": "^4.0.0",
+    "gatsby-transformer-sharp": "^3.3.0",
     "js-cookie": "^2.2.1",
     "node-fetch": "^2.6.1",
     "node-sass": "^4.14.1",