Add DJ logo to registration page.

Author: meisterT

webapp/templates/security/register.html.twig

@@ -11,6 +11,9 @@
 
 {% block body %}
 <main>
+    <div style="text-align: center;">
+        <img class="mb-4" src="{{ asset('images/DOMjudgelogo.svg') }}" alt="DOMjudge" width="72">
+    </div>
         {{ form_start(registration_form, { 'attr': {'class': 'form-signin'} }) }}
         <h1 class="h3 mb-3 fw-normal">Register Account</h1>
         <div class="mb-2">