Reorganized code + migration to go1.22

templates/mock_gateway.gohtml

@@ -20,8 +20,8 @@
     <section class="container">
     <h2>Mock gateway {{.Entry.Id.String}}</h2>
     <p>{{formatCurrency .Entry.TotalAmount}}</p>
-    <a href="/providers/mock/success?id={{.Entry.Id.String}}" class="btn btn-success">Potvrdi plaćanje</a>
-    <a href="/providers/mock/error?id={{.Entry.Id.String}}" class="btn btn-danger">Otkaži plaćanje</a>
+    <a href="/mock/success?id={{.Entry.Id.String}}" class="btn btn-success">Potvrdi plaćanje</a>
+    <a href="/mock/error?id={{.Entry.Id.String}}" class="btn btn-danger">Otkaži plaćanje</a>
     </section>
 </body>
 </html>