[pagex] implement visibility flags

[voidcannon] migrate to visibility flags

content/articles/playground-empty/playground-empty.pagex.js

@@ -1,4 +1,4 @@
-import {VoidcannonContentType, VoidcannonVisibilityLevel} from "voidcannon";
+import {VoidcannonContentType, VoidcannonVisibilityFlags} from "voidcannon";
 
 import placeholder from "../../authors/placeholder.pagex.js";
 
@@ -13,6 +13,9 @@ export default {
     id: "playground-empty",
     title: "Playground Empty Article",
     created_at: 1762267626610,
-    visibility_level: VoidcannonVisibilityLevel.HIDDEN_IN_RECENTS,
+    visibility_flags: [
+        VoidcannonVisibilityFlags.HIDDEN_IN_RECENTS,
+        VoidcannonVisibilityFlags.HIDDEN_IN_SITEMAP,
+    ],
     authors: [placeholder]
 }