global: replace nwb with create-react-app

- nwb is not anymore mantained and it is obsolete with many security
issues
- create-react-app is now used for development
- babel cli is used for building the library, but is not optimal. It
will require the integration of a build system with ad-hoc configuration

Author: ntarocco

.babelrc

@@ -1,15 +1,3 @@
 {
-  "plugins": [
-    [
-      "@babel/plugin-transform-runtime",
-      {
-        "regenerator": true
-      }
-    ],
-    "@babel/plugin-proposal-class-properties"
-  ],
-  "presets": [
-    ["@babel/preset-env", { "targets": "> 0.25%, not dead" }], // https://babeljs.io/docs/en/babel-preset-env#targets
-    "@babel/preset-react"
-  ]
+  "presets": ["react-app"]
 }

.eslintrc.json

@@ -1,7 +1,7 @@
 /coverage
-/demo/dist
 /es
 /lib
+/dist
 /node_modules
 /umd
 /docs/website/node_modules