Move dev dependencies to the devDependencies section.

Remove react-helmet

package.json

@@ -42,24 +42,7 @@
   },
   "homepage": "https://github.com/bbc/web-vitals/blob/main/README.md",
   "dependencies": {
-    "@babel/cli": "7.14.5",
-    "@babel/core": "7.14.6",
-    "@babel/plugin-proposal-export-default-from": "7.14.5",
-    "@babel/plugin-transform-modules-commonjs": "7.14.5",
-    "@babel/plugin-transform-runtime": "7.14.5",
-    "@babel/preset-env": "7.14.5",
-    "@babel/preset-react": "7.14.5",
-    "babel-eslint": "10.1.0",
     "cross-fetch": "^3.1.5",
-    "eslint": "^7.10.0",
-    "eslint-config-prettier": "^8.0.0",
-    "eslint-plugin-es5": "^1.5.0",
-    "eslint-plugin-import": "^2.22.1",
-    "eslint-plugin-json": "3.1.0",
-    "eslint-plugin-prettier": "4.0.0",
-    "eslint-plugin-react": "7.22.0",
-    "prettier": "2.2.1",
-    "react-helmet": "^6.1.0",
     "shelljs": "0.8.5",
     "web-vitals": "^3.3.2"
   },
@@ -78,8 +61,17 @@
     "@testing-library/jest-dom": "^6.4.5",
     "@testing-library/react": "^15.0.0",
     "@testing-library/user-event": "^14.5.2",
+    "babel-eslint": "10.1.0",
+    "eslint": "^7.10.0",
+    "eslint-config-prettier": "^8.0.0",
+    "eslint-plugin-es5": "^1.5.0",
+    "eslint-plugin-import": "^2.22.1",
+    "eslint-plugin-json": "3.1.0",
+    "eslint-plugin-prettier": "4.0.0",
+    "eslint-plugin-react": "7.22.0",
     "jest": "^29.7.0",
     "jest-environment-jsdom": "^29.7.0",
+    "prettier": "2.2.1",
     "react": "18.2.0",
     "react-dom": "18.2.0"
   },

yarn.lock

@@ -1682,7 +1682,6 @@ __metadata:
     prettier: 2.2.1
     react: 18.2.0
     react-dom: 18.2.0
-    react-helmet: ^6.1.0
     shelljs: 0.8.5
     web-vitals: ^3.3.2
   peerDependencies:
@@ -6273,27 +6272,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"react-fast-compare@npm:^3.1.1":
-  version: 3.2.2
-  resolution: "react-fast-compare@npm:3.2.2"
-  checksum: 2071415b4f76a3e6b55c84611c4d24dcb12ffc85811a2840b5a3f1ff2d1a99be1020d9437ee7c6e024c9f4cbb84ceb35e48cf84f28fcb00265ad2dfdd3947704
-  languageName: node
-  linkType: hard
-
-"react-helmet@npm:^6.1.0":
-  version: 6.1.0
-  resolution: "react-helmet@npm:6.1.0"
-  dependencies:
-    object-assign: ^4.1.1
-    prop-types: ^15.7.2
-    react-fast-compare: ^3.1.1
-    react-side-effect: ^2.1.0
-  peerDependencies:
-    react: ">=16.3.0"
-  checksum: a4998479dab7fc1c2799eddefb1870a9d881b5f71cfdf97979a9882e42f4bb50402d55335f308f461e735e01a06f46b16cc7b4e6bcb22c7a4a6f85a753c5c106
-  languageName: node
-  linkType: hard
-
 "react-is@npm:^16.13.1":
   version: 16.13.1
   resolution: "react-is@npm:16.13.1"
@@ -6315,15 +6293,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"react-side-effect@npm:^2.1.0":
-  version: 2.1.2
-  resolution: "react-side-effect@npm:2.1.2"
-  peerDependencies:
-    react: ^16.3.0 || ^17.0.0 || ^18.0.0
-  checksum: c5eb1f42b464fb093bca59aaae0f1b2060373a2aaff95275b8781493628cdbbb6acdd6014e7883782c65c361f35a30f28cc515d68a1263ddb39cbbc47110be53
-  languageName: node
-  linkType: hard
-
 "react@npm:18.2.0":
   version: 18.2.0
   resolution: "react@npm:18.2.0"