Super fly login

Styles for login page and password recovery page

Do we need the link for the "Sign Up"? I don't think users are gonna be signing up with that form right, so I'll wait on the schema updates for the donor/recipient profiles until I work on that
Maybe you'd like to check out
https://github.com/SamLau95/cs61as-quiz-system/blob/master/app/views/shared/_flash.html.slim
to make dynamic calls to toastr! The only problem is that you have to make sure toastr has the methods you need (as in if you set flash[:notice], toastr needs to have the notice method)