185

Hello again! Found another simple bug to squash. This should address #185.

I've removed the devise helper for errorrs, and placed them into an alert box. 

This bit of code may make more sense in a helper so all forms will have the same UI. 

I also removed the devise shared links, as they seemed out of place. 
This hasn't been made explicit in [https://openfarm.cc/pages/styles/](the styles), but could you use `centered` instead of `small-centered`. This is a non-foundation class that is meant to capture all of the all `large-` `medium-` and `small-` centering.