Remove HTML from routes

[ivan-unfolds]

At the moment you're setting some of the HTML in templates.js and some of it in your routes (specifically here)

It helps to have a separation of concerns between the routing logic and the templates as an app gets bigger. Say we want to know where a certain css class is set, we should only have to look in one place, ie where the templates live. As the code is at the moment, we would also have to look inside the server routes.

This is a bit difficult to explain in writing so I'll talk about during the live code review tomorrow. Let me know if you have any questions afterwards!