Demo preview_image update

Author: kodster28

src/content/changelog/ai-gateway/2025-02-26-guardrails.mdx

@@ -1,9 +1,8 @@
 ---
 title: Introducing Guardrails in AI Gateway
 description: Keep AI interactions secure and risk-free with Guardrails in AI Gateway
-products:
-  - ai-gateway
 date: 2025-02-26T6:00:00Z
+preview_image: ~/assets/images/ai-gateway/Guardrails.png
 ---
 
 [AI Gateway](/ai-gateway/) now includes [Guardrails](/ai-gateway/guardrails/), to help you monitor your AI apps for harmful or inappropriate content and deploy safely.