excise settings-container and login-container outright. full width babey

app/templates/users/sign_up.html

@@ -1,7 +1,7 @@
 {% extends 'base.html' %}
 {% block title %}Sign up{% endblock %}
 {% block content %}
-<div class="darkbg login-container">
+<div class="darkbg">
   <h1>Sign up</h1>
   {% if inviter %}
   <p>You have been invited by <a href="{{ url_for('users.page', username=inviter.username) }}">{{ inviter.get_readable_name() }}</a> to join {{ config.SITE_NAME }}. Create an identity below.</p>