Better mastodon profile pic

david/mastodon/profile.json

@@ -21,10 +21,10 @@
         "sharedInbox": "https://larlet.fr/dummy"
     },
     "id": "https://larlet.fr/david/mastodon/profile.json",
-    "image": {
-        "mediaType": "image/jpeg",
+    "icon": {
+        "mediaType": "image/png",
         "type": "Image",
-        "url": "https://larlet.fr/static/david/david-larlet-avatar.jpg"
+        "url": "https://larlet.fr/static/david/david-larlet-avatar-bleu.png"
     },
     "inbox": "https://larlet.fr/david/mastodon/inbox.json",
     "manuallyApprovesFollowers": false,