fix(plugins): remove React from peerDependencies

Author: hoobdeebla

packages/gatsby-link/package.json

@@ -19,9 +19,7 @@
     "cross-env": "^7.0.3"
   },
   "peerDependencies": {
-    "@reach/router": "^1.3.3",
-    "react": "^16.4.2",
-    "react-dom": "^16.4.2"
+    "@reach/router": "^1.3.4"
   },
   "homepage": "https://github.com/gatsbyjs/gatsby/tree/master/packages/gatsby-link#readme",
   "keywords": [

packages/gatsby-plugin-google-analytics/package.json

@@ -26,9 +26,7 @@
   "license": "MIT",
   "main": "index.js",
   "peerDependencies": {
-    "gatsby": "^2.0.0",
-    "react": "^16.4.2",
-    "react-dom": "^16.4.2"
+    "gatsby": "^2.0.0"
   },
   "repository": {
     "type": "git",

packages/gatsby-plugin-image/package.json

@@ -75,9 +75,7 @@
   "peerDependencies": {
     "gatsby": ">=2",
     "gatsby-image": "*",
-    "gatsby-plugin-sharp": "*",
-    "react": ">=16.8.0",
-    "react-dom": ">=16.8.0"
+    "gatsby-plugin-sharp": "*"
   },
   "dependencies": {
     "@babel/parser": "^7.12.5",

packages/gatsby-plugin-netlify-cms/package.json

@@ -37,9 +37,7 @@
   "main": "index.js",
   "peerDependencies": {
     "gatsby": "^2.0.101",
-    "netlify-cms-app": "^2.9.0",
-    "react": "^16.8.4",
-    "react-dom": "^16.8.4"
+    "netlify-cms-app": "^2.9.0"
   },
   "repository": {
     "type": "git",

packages/gatsby-plugin-styletron/package.json

@@ -23,7 +23,6 @@
   "main": "index.js",
   "peerDependencies": {
     "gatsby": "^2.0.0",
-    "react": "^16.4.2",
     "styletron-engine-atomic": "^1.4.6",
     "styletron-react": "^5.2.7"
   },

packages/gatsby-plugin-typography/package.json

@@ -30,8 +30,6 @@
   "main": "index.js",
   "peerDependencies": {
     "gatsby": "^2.0.0",
-    "react": "^16.4.2",
-    "react-dom": "^16.4.2",
     "react-typography": "^0.16.1 || ^1.0.0-alpha.0",
     "typography": "^0.16.0 || ^1.0.0-alpha.0"
   },

packages/gatsby-react-router-scroll/package.json

@@ -24,9 +24,7 @@
   "license": "MIT",
   "main": "index.js",
   "peerDependencies": {
-    "@reach/router": "^1.0.0",
-    "react": "^16.4.2",
-    "react-dom": "^16.4.2"
+    "@reach/router": "^1.3.4"
   },
   "repository": {
     "type": "git",