removed header template part from skatepark's json (#5233)

skatepark/theme.json

@@ -1,12 +1,6 @@
 {
 	"$schema": "https://json.schemastore.org/theme-v1.json",
 	"version": 1,
-	"templateParts": [
-		{
-			"name": "header-ollie",
-			"area": "header"
-		}
-	],
 	"settings": {
 		"color": {
 			"duotone": [