Update the Widget page to use data passed to the template

cmd/web/templates/buy-once.page.gohtml

@@ -3,6 +3,7 @@
 Buy one widget
 {{ end }}
 {{ define "content" }}
+{{$widget := index .Data "widget"}}
 <h2 class="mt-3 text-center">Buy One Widget</h2>
 <hr>
 <img src="/static/img/widget.jpeg"
@@ -17,15 +18,12 @@ Buy one widget
       class="d-blick needs-validation charge-form"
       autocomplete="off"
       novalidate="">
-    <div class="mb-3">
-        <label for="amount" class="form-label">Amount</label>
-        <input type="text"
-               id="amount"
-               name="amount"
-               autocomplete="amount-new"
-               required=""
-               class="form-control">
-    </div>
+    <input type="hidden" name="product_id" value="{{$widget.ID}}">
+    <input type="hidden" name="amount" value="{{$widget.Price}}">
+    <h3 class="mt-2 mb-3 text-center">{{$widget.Name}}: {{$widget.Price}}</h3>
+    <p class="mt-2 mb-3 text-center">{{$widget.Description}}</p>
+    <hr>
+
     <div class="mb-3">
         <label for="cardholder-name" class="form-label">Cardholder Name</label>
         <input type="text"