Implement optional registration

bookmarks/templates/django_registration/registration_complete.html

@@ -0,0 +1,16 @@
+{% extends 'bookmarks/layout.html' %}
+{% load widget_tweaks %}
+
+{% block title %}Registration complete{% endblock %}
+
+{% block content %}
+
+    <div class="auth-page">
+        <div class="columns">
+            <section class="content-area column col-12">
+                <p>Registration complete. You can now use the application.</p>
+            </section>
+        </div>
+    </div>
+
+{% endblock %}