voidcannon: support icons for author avatars

content: migrate test articles to test author

src/content/articles/playground-p3/playground-p3.pagex.js

@@ -5,7 +5,7 @@ import {
     VoidcannonVisibilityLevel
 } from "voidcannon";
 
-import bignutty from "../../authors/bignutty.pagex.js";
+import testauthorPagex from "../../authors/testauthor.pagex.js";
 
 import videogamesCollection from "../../collections/videogames.pagex.js";
 import testCollection from "../../collections/test.pagex.js";
@@ -62,7 +62,7 @@ export default {
         },
         color: "#0eb1f4"
     },
-    authors: [bignutty],
+    authors: [testauthorPagex],
     collections: [
         videogamesCollection.id,
         testCollection.id,