Added notificcations about role changes

main/templates/base/success_messages.html

@@ -0,0 +1,14 @@
+<div class="mt-5">
+  {% for message in messages %}
+    <div
+      class="alert alert-{{ message.tags }} alert-dismissible fade show p-2"
+      role="alert"
+      style="display: flex; align-items: center; justify-content: space-between;"
+    >
+      {{ message }}
+      <div>
+        <button type="button" class="btn btn-light p-2" data-bs-dismiss="alert" aria-label="Close">X</button>
+      </div>
+    </div>
+  {% endfor %}
+</div>