Make package.json scripts work on Windows (#657)

* Make package.json scripts work on Windows

* Replace concurrently with npm-run-all

* add build to start script

* run build in prestart (not start)

also rename install-web.js to install-examples.js

Co-authored-by: Nicolo Davis <[email protected]>
Co-authored-by: Chris Swithinbank <[email protected]>

Author: 3 people

integration/package.json

@@ -7,10 +7,13 @@
     "react-dom": "^16.7.0",
     "react-scripts": "^2.1.3"
   },
+  "devDependencies": {
+    "cross-env": "^7.0.2"
+  },
   "scripts": {
     "start": "react-scripts start",
     "build": "react-scripts build",
-    "test": "CI=true react-scripts test",
+    "test": "cross-env CI=true react-scripts test",
     "eject": "react-scripts eject"
   },
   "eslintConfig": {