feat(templates): improve breakpoints

templates/productlist.html

@@ -38,7 +38,7 @@
 <div class="row itemlist">
   {% for product in products %}
     {# Show an item per product, consisting of the name, image, price and stock, triggering a purchase on click #}
-    <div class="col-sm-1 g-4">
+    <div class="col-xl-1 col-md-2 col-sm-3 col-4 g-4">
       {% if product.custom_price %}
 	<a class="card h-100 text-bg-light" onclick="setup_custom_price({{ product.id }}, '{{ product.name}}');">
       {% else %}