add cellular_raza to showcase exampleSite

exampleSite/content/showcase/index.md

@@ -15,7 +15,7 @@ Open source projects powered by Hextra
   {{< card
         link="https://github.com/jonaspleyer/cellular_raza"
         title="cellular_raza"
-        image="https://github.com/user-attachments/assets/f24c6455-b70a-419b-b025-e3d60101b673"
+        image="/images/cellular_raza.png"
         imageStyle="object-fit:cover; aspect-ratio:16/9;"
   >}}