academy routing

[BenGamma]

As it is an iframe now, you can only see the /academy.

Allow user to navigate with URLs. Update the routing depending on the iframe using postMessage

[chrismclarke]

Just to elaborate a bit more, the academy uses an iframe to show content from a static site generated at: https://onearmy.github.io/academy

We want to be able to directly link to sections in the academy from the main site, i.e.,

https://onearmy.github.io/academy/plastic/basics
should be viewable at
https://dev.onearmy.world/academy/plastic/basics

This can probably be done simply by binding the iframe src url to a variable that also track the current site url. Alternatively (/possibly one for the future), we might want to look at better ways to communicate between both sites using postmessages.

Open for anyone interested