Update `index.html`

* Remove link to the `node build script` repository as the project is no
  longer maintained.

* Change `touch-device icons` to `touch-device icon` as HTML5Boilerplate
  now includes only one apple-touch-icon:
  https://github.com/h5bp/html5-boilerplate/commit/71ca9fb7a06bfcd2359c924ca261d41d1dd03e8d.