Hide email in profile as well

We're not using it, so its just confusing.

app/views/devise/registrations/edit.html.erb

@@ -9,7 +9,7 @@
     <%= f.text_field :name, autofocus: true, autocomplete: "username" %>
   </div>
 
-  <div class="field">
+  <div class="field hidden">
     <%= f.label :email %><br />
     <%= f.email_field :email, autocomplete: "email" %>
   </div>