feat: add stub implementation for image

QRCodeFromEntity

fix: base64 StubQRCodeGenerator

templates/index/homepage.html.twig

@@ -2,6 +2,12 @@
 
 {% block body %}
 <div class="container">
+    {% if qrCodeImage %}
+        <div class="d-flex p-3 justify-content-center qr-code-image">
+            <img src="data:image/png;base64,{{ qrCodeImage }}" alt="QR code" />
+        </div>
+        <h2 class="header-another-code">{{  "You can generate another QR code here" | trans }}:</h2>
+    {% endif %}
     {{ form_start(form) }}
     <div class="mb-3 col-auto">
         {{ form_label(form.iban) }}