fix: add integrity attributes to Stripe and n8n stylesheets for security

tienda/templates/tienda/base.html

@@ -7,12 +7,6 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <meta name="description" content="Sitio web de comercio local Almeriense">
-    <title>Comercialmeria</title>
-    <link rel="preload" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" as="style" onload="this.onload=null;this.rel='stylesheet'">
-
-    <noscript>
-        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css">
-    </noscript>
     <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.8/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-sRIl4kxILFvY47J16cr9ZwB07vP4J8+LH7qKQnuqkuIAvNWLzeN8tE5YBujZqJLB" crossorigin="anonymous">
     <link rel="preload" href="{% static 'css/custom.css' %}" as="style" onload="this.onload=null;this.rel='stylesheet'">
     <noscript><link rel="stylesheet" href="{% static 'css/custom.css' %}"></noscript>
@@ -345,7 +339,7 @@
     </script>
     {% endcache %}
 
-    <link href="https://cdn.jsdelivr.net/npm/@n8n/chat/dist/style.css" rel="stylesheet" />
+    <link href="https://cdn.jsdelivr.net/npm/@n8n/chat/dist/style.css" rel="stylesheet" integrity="sha384-b7166c239e461f42296ad7248c04ef6768e9340a51aef45fad197acf8f4c16f119f36376b19516548885a9ecabdccc10" />
     <script type="module">
         import { createChat } from 'https://cdn.jsdelivr.net/npm/@n8n/chat/dist/chat.bundle.es.js';
 

tienda/templates/tienda/checkout.html

@@ -3,7 +3,7 @@
 {% load vat_filters %}
 
 {% block head %}
-<script src="https://js.stripe.com/v3/"></script>
+<script src="https://js.stripe.com/v3/" integrity="sha384-353f1ae25ae0929bea5f9379a594131b27e45a89d8f918dcc040c4ccbe6fd35fe6fd1d61ccc6e0c911c9b54325235904"></script>
 <script src="https://www.paypal.com/sdk/js?client-id={{ paypal_client_id }}&currency=EUR" defer></script>
 <style>
     #card-element {