added flash message for logout

application/dashboard/templates/flash.html

@@ -0,0 +1,18 @@
+<svg xmlns="http://www.w3.org/2000/svg" class="d-none">
+    <symbol id="check-circle-fill" viewBox="0 0 16 16">
+        <path
+            d="M16 8A8 8 0 1 1 0 8a8 8 0 0 1 16 0zm-3.97-3.03a.75.75 0 0 0-1.08.022L7.477 9.417 5.384 7.323a.75.75 0 0 0-1.06 1.06L6.97 11.03a.75.75 0 0 0 1.079-.02l3.992-4.99a.75.75 0 0 0-.01-1.05z" />
+    </symbol>
+</svg>
+
+<div class="position-fixed w-25 bottom-0" style="z-index: 1050;">
+    {% for message in get_flashed_messages() %}
+    <div class="alert alert-success alert-dismissible fade show" role="alert">
+        <svg class="bi flex-shrink-0 me-2" width="15" height="15" role="img" aria-label="Success:">
+            <use xlink:href="#check-circle-fill" />
+        </svg>
+        {{message}}
+        <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
+    </div>
+    {% endfor %}
+</div>