Implement a new login redesign per Waseem. Be a little cute about it.

Split off some content previously placed into base back into index.html.
Move content previously localised in accounts_home to a new content_base
for use in the non-app version of the site.

We wrote up some copy and styled it according to taste.

In our new signup form, we no longer collect a short name and instead
extrapolate from the email.

(imported from commit cd734b13a4bda7f304129379524c4cc96b77b24b)

zephyr/forms.py

@@ -2,6 +2,5 @@ from django import forms
 
 class RegistrationForm(forms.Form):
     full_name = forms.CharField(max_length=100)
-    short_name = forms.CharField(max_length=100)
     email = forms.EmailField()
     password = forms.CharField(widget=forms.PasswordInput, max_length=100)