[ghost] use png as icon (CloudPirates-io#200)

Author: dloewen2

charts/ghost/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 name: ghost
 description: A simple, powerful publishing platform that allows you to share your stories with the world.
 type: application
-version: 0.2.1
+version: 0.2.2
 appVersion: "6.0.9"
 keywords:
   - ghost
@@ -25,4 +25,4 @@ dependencies:
     version: "0.3.x"
     repository: oci://registry-1.docker.io/cloudpirates
     condition: mariadb.enabled
-icon: https://a.storyblok.com/f/143071/512x512/28cdb1ef38/ghost-logo.svg
+icon: https://a.storyblok.com/f/143071/512x512/3a5c1cb0c5/ghost-logo.png