add confirm before email deletion

app/templates/base.html

@@ -9,7 +9,7 @@
     {% endblock %}
     <hr>
     <div>
-        <img src="/static/img/logo.png" alt="Logo" style="height: 50px;">
+        <img src="{{ url_for('static', filename='img/logo.png') }}" alt="Logo" style="height: 50px;">
     </div>
 </body>
 </html>

app/templates/index.html

@@ -36,7 +36,7 @@
   </form>
 
   <h3>Supprimer boîte mail</h3>
-  <form method="post">
+  <form method="post" onsubmit="return confirmDeleteMailbox();">
     {{ delete_form.hidden_tag() }}
     {{ delete_form.email.label }} {{ delete_form.email }}<br>
     {{ delete_form.submit }}
@@ -64,4 +64,10 @@
   <hr>
   <a href="{{ url_for('logout') }}">Logout</a>
 
+  <script>
+    function confirmDeleteMailbox() {
+        return confirm("Êtes-vous sûr de vouloir supprimer cette boîte mail ?");
+    }
+  </script>
+
 {% endblock %}