Update alcohol.html

Author: david-evans84-NHSD

app/views/david/alcohol.html

@@ -83,4 +83,7 @@ <h3>Enter all that apply</h3>
     </div>  
 
   </div>
+  <button class="nhsuk-button" data-module="nhsuk-button" type="submit">
+    Continue
+  </button>
 {% endblock %}