Add slide comparing postgres to ES

slides.md

@@ -452,15 +452,32 @@ layout: center
 # Why something built-in?
 
 <Transform :scale="1.3">
-<v-clicks>
 
-- Reduces barrier to entry
 - Improve interoperability
 - Reduce cognitive load
+- Reduce barrier to entry
 
-</v-clicks>
 </Transform>
 
+---
+layout: center
+---
+
+![](/elasticsearch.png){.max-h-32.mx-auto}
+
+## vs
+
+![](/postgres.png){.max-h-48.mx-auto}
+
+
+<style>
+.slidev-layout {
+    background: white;
+    color: black;
+    text-align: center;
+}
+</style>
+
 ---
 layout: section
 ---