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 am curious where this name `custom-2722` comes from ... It doesn't seem very descriptive, but I'm also totally new to this landing page thing, so I'm likely missing some context here.