Remove GitHub buttons script include

It has no purpose and is bad for privacy.

app/templates/order_items.html

@@ -14,7 +14,6 @@ Haldis - Order {{ order.id }}
 
 {% block scripts %}
 	{{ super() }}
-	<script async defer id="github-bjs" src="https://buttons.github.io/buttons.js"></script>
 	<script type="text/javascript" src="{{ url_for('static', filename='js/timer.js') }}"></script>
 {% endblock %}