Update page-ad-image URI format in publish.yml (#2594)

Author: recrwplay

publish.yml

@@ -60,10 +60,10 @@ asciidoc:
     neo4j-download-center-uri: https://neo4j.com/deployment-center
     # NODES 2025
     page-ad-overline-link: https://www.neo4j.com/nodes-2025?utm_source=docs&utm_medium=banner
-    page-ad-image: /assets/img/nodes-25.png
+    page-ad-image: "{neo4j-docs-base-uri}/assets/img/nodes-25.png"
     page-ad-title: Neo4j Online Developer Conference
     page-ad-description: Join us on November 6 for 24hrs of live and unique tech talks on graphs and AI
     page-ad-link: https://www.neo4j.com/nodes-2025?utm_source=docs&utm_medium=banner
     page-ad-underline-role: button
     page-ad-underline: Register
-    
+