First pass at converting unstyled templates to match site style

theme/templates/account/signup_closed.html

@@ -0,0 +1,14 @@
+{% extends 'base.html' %}
+{% load i18n %}
+{% load allauth %}
+
+{% block head_title %}{% trans "Sign Up Closed" %}{% endblock head_title %}
+
+{% block content %}
+<div class="container mx-auto max-w-md mt-6 text-center">
+  <h1 class="text-3xl font-bold mb-6">{% trans "Sign Up Closed" %}</h1>
+  <p class="text-gray-700">
+    {% trans "We are sorry, but the sign up is currently closed." %}
+  </p>
+</div>
+{% endblock content %}