Add slide talking about use of Celery

slides.md

@@ -491,10 +491,18 @@ layout: section
 </v-click>
 
 ---
-layout: section
+layout: cover
+background: https://docs.celeryq.dev/en/stable/_static/celery_512.png
 ---
 
-# Where are we going?
+# Is this the end?
+
+<style>
+.slidev-layout {
+    background: white;
+}
+</style>
+
 
 ---
 layout: image-right