Fix alert warning outdated box

CAUSE

The author of the commit 0f560a409
should have changed already updated
index.XX.xhtml pages too.

index.it.xhtml

@@ -54,7 +54,7 @@
       </div>
 
       <div id="shop-promo" class="section">
-          <img src="/graphics/tshirt-promo.jpg" alt="" />
+          <a href="/order/order.html?ref-frontpage"><img src="/graphics/tshirt-promo.jpg" alt="" /></a>
 
           <a class="big-donate" href="/order/order.html?ref-frontpage">Negozio</a>
       </div>