lock package.json versions, take gatsby to 2.24.7

Should fix:
#282
(Due to gatsbyjs/gatsby#25778)

We initially tried 2.24.1:
5fd5a56

But that seems to have caused:
gatsbyjs/gatsby#25899

But the comment from that issue seems to work:
gatsbyjs/gatsby#25899 (comment)

Author: adamschwartz

package.json

@@ -5,55 +5,56 @@
   "version": "0.1.0",
   "author": "Cloudflare <github@cloudflare.com>",
   "dependencies": {
-    "@adaptivelink/pops": "^0.2.3",
+    "@adaptivelink/pops": "0.2.3",
     "@cloudflare/workers-brand-assets": "3.0.1",
-    "@material-ui/core": "^4.11.0",
-    "@mdx-js/mdx": "^1.6.6",
-    "@mdx-js/react": "^1.6.6",
-    "@reach/skip-nav": "^0.10.5",
-    "animejs": "^3.2.0",
-    "focus-group": "^0.3.1",
-    "focus-visible-polyfill": "^1.0.0",
-    "gatsby": "^2.24.1",
-    "gatsby-image": "^2.4.13",
-    "gatsby-plugin-layout": "^1.3.10",
-    "gatsby-plugin-manifest": "^2.4.18",
-    "gatsby-plugin-material-ui": "^2.1.9",
-    "gatsby-plugin-mdx": "^1.2.25",
-    "gatsby-plugin-no-sourcemaps": "^2.2.0",
-    "gatsby-plugin-offline": "^3.2.17",
-    "gatsby-plugin-react-helmet": "^3.3.10",
-    "gatsby-plugin-sharp": "^2.6.19",
-    "gatsby-plugin-sitemap": "^2.4.11",
-    "gatsby-remark-copy-linked-files": "^2.3.9",
-    "gatsby-remark-images": "^3.3.18",
-    "gatsby-source-filesystem": "^2.3.19",
-    "gatsby-transformer-remark": "^2.8.22",
-    "gatsby-transformer-sharp": "^2.5.11",
-    "gray-matter": "^4.0.2",
-    "prism-react-renderer": "^1.1.1",
-    "prismjs": "^1.20.0",
-    "prop-types": "^15.7.2",
-    "react": "^16.13.1",
-    "react-copy-to-clipboard": "^5.0.2",
-    "react-custom-scrollbars": "^4.2.1",
-    "react-dom": "^16.13.1",
-    "react-helmet": "^6.1.0",
-    "react-spring": "^8.0.27",
-    "react-timeago": "^4.4.0",
-    "react-transition-group": "^4.4.1",
-    "remark-slug": "^6.0.0",
-    "saber-plugin-git-modification-time": "^0.1.3",
-    "set-interval-visible": "^2.0.0"
+    "@material-ui/core": "4.11.0",
+    "@mdx-js/mdx": "1.6.6",
+    "@mdx-js/react": "1.6.6",
+    "@reach/skip-nav": "0.10.5",
+    "animejs": "3.2.0",
+    "focus-group": "0.3.1",
+    "focus-visible-polyfill": "1.0.0",
+    "gatsby": "2.24.7",
+    "gatsby-image": "2.4.13",
+    "gatsby-plugin-layout": "1.3.10",
+    "gatsby-plugin-manifest": "2.4.18",
+    "gatsby-plugin-material-ui": "2.1.9",
+    "gatsby-plugin-mdx": "1.2.25",
+    "gatsby-plugin-no-sourcemaps": "2.2.0",
+    "gatsby-plugin-offline": "3.2.17",
+    "gatsby-plugin-react-helmet": "3.3.10",
+    "gatsby-plugin-sharp": "2.6.19",
+    "gatsby-plugin-sitemap": "2.4.11",
+    "gatsby-remark-copy-linked-files": "2.3.9",
+    "gatsby-remark-images": "3.3.18",
+    "gatsby-source-filesystem": "2.3.19",
+    "gatsby-transformer-remark": "2.8.22",
+    "gatsby-transformer-sharp": "2.5.11",
+    "graphql": "14.7.0",
+    "gray-matter": "4.0.2",
+    "prism-react-renderer": "1.1.1",
+    "prismjs": "1.20.0",
+    "prop-types": "15.7.2",
+    "react": "16.13.1",
+    "react-copy-to-clipboard": "5.0.2",
+    "react-custom-scrollbars": "4.2.1",
+    "react-dom": "16.13.1",
+    "react-helmet": "6.1.0",
+    "react-spring": "8.0.27",
+    "react-timeago": "4.4.0",
+    "react-transition-group": "4.4.1",
+    "remark-slug": "6.0.0",
+    "saber-plugin-git-modification-time": "0.1.3",
+    "set-interval-visible": "2.0.0"
   },
   "engines": {
     "node": ">=12.0.0"
   },
   "devDependencies": {
-    "eslint-config-react-app": "^5.2.1",
-    "gatsby-plugin-eslint": "^2.0.8",
-    "gatsby-plugin-remove-trailing-slashes": "^2.3.11",
-    "prettier": "^1.19.1"
+    "eslint-config-react-app": "5.2.1",
+    "gatsby-plugin-eslint": "2.0.8",
+    "gatsby-plugin-remove-trailing-slashes": "2.3.11",
+    "prettier": "1.19.1"
   },
   "license": "Apache-2.0 OR MIT",
   "scripts": {