WIP: Bug 1038395 - Build CTA landing page for learners / makers

<http://localhost:9006/from/firefox-2014/>
<http://localhost:9006/for/learners/>
<http://localhost:9006/for/mentors/>
I noticed that the `mad-libs.js` has a `"use strict"` here (yay strict mode!) but this file doesn't. Is that intentional?