🔧 Update React imports (#859)

* 🔧 Change React imports

Explicitly import `* as React`

* 🎨 Get React version from Core React package.json

Since we’re not using the latest version of React at the moment, we
can’t have Eslint assume we’re using it when linting the code

* 📝 Update README

* 📌 Update lock-files

.eslintrc.js

@@ -1,3 +1,9 @@
+const pkg = require('./libraries/core-react/package.json')
+
+const {
+  devDependencies: { react: reactVersion },
+} = pkg
+
 module.exports = {
   root: true,
   extends: [
@@ -25,7 +31,7 @@ module.exports = {
   },
   settings: {
     react: {
-      version: 'detect',
+      version: reactVersion,
     },
   },
   globals: {