Update dev/breadcrumb.html

Co-authored-by: Serhii Kulykov <[email protected]>

Author: Artur-

dev/breadcrumb.html

@@ -6,8 +6,8 @@
   <title>vaadin-breadcrumb</title>
   <script type="module" src="./common.js"></script>
   <script type="module">
-    import '../packages/breadcrumb/vaadin-breadcrumb.js';
-    import '../packages/breadcrumb/vaadin-breadcrumb-item.js';
+    import '@vaadin/breadcrumb/vaadin-breadcrumb.js';
+    import '@vaadin/breadcrumb/vaadin-breadcrumb-item.js';
   </script>
   <style>
     .demo-section {