fix: adjust content and demo to be UK-centric

lib/simpleshop_theme/theme/preview_data.ex

@@ -28,6 +28,26 @@ defmodule SimpleshopTheme.Theme.PreviewData do
     mock_cart_items()
   end
 
+  @doc """
+  Returns cart drawer items formatted for the cart drawer component.
+  """
+  def cart_drawer_items do
+    [
+      %{
+        name: "Autumn Fern",
+        variant: "A4 / Unframed",
+        price: "£24.00",
+        image: "https://picsum.photos/seed/fern/120/120"
+      },
+      %{
+        name: "Wild Roses",
+        variant: "A3 / Oak frame",
+        price: "£48.00",
+        image: "https://picsum.photos/seed/roses/120/120"
+      }
+    ]
+  end
+
   @doc """
   Returns testimonials for preview.