live seat availability: fetch from server webhook, orange/red styling when <10/0 seats, disable sold-out locations

index.html

@@ -801,7 +801,7 @@
                         <option value="yearly">Yearly</option>
                     </select>
                     <select class="pricing-config-select" id="pricing-location">
-                        <option value="france">France</option>
+                        <option value="">Loading locations...</option>
                     </select>
                     <input
                         type="email"