Change "Apply voucher" button into a link

I can't find the form that should be displayed here, so the simplest
thing I can do at 11pm is to make this a link. That's unsatisfying but
hopefully works.

pinaxcon/templates/registrasion/review.html

@@ -11,6 +11,7 @@
 
 {% block scripts_extra %}
   {{ voucher_form.media.js }}
+  {{ form.media.js }}
 
   <script type="text/javascript">
     function showVoucherForm() {
@@ -24,7 +25,7 @@
 
 
 {% block content %}
-  <button id="voucher-form-button" class="btn" onclick="showVoucherForm()">Enter voucher code</button>
+  <a id="voucher-form-button" class="btn btn-info" href="{% url "voucher_code" %}">Enter voucher code</a>
 
   {% items_pending as pending %}
   {% if pending %}