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 guess it is actually possible:

https://toolness.makes.org/thimble/LTE0MDg4OTI2NzI=/mighty-sessionstorage-overload-fun

However, it seems quite unlikely, unless another page in the same domain is storing lots of stuff in `sessionStorage`, or something weird like that.

I guess surrounding it in a try/catch and just eating the exception in this case might be an easy fix to ensure that, in the extremely unlikely case that it happens, the user's experience isn't derailed... but it's probably not a big deal!