Added github logo which is less likely to disappear.

Author: newzealandpaul

json/wavelog.json

@@ -11,7 +11,7 @@
     "interface_port": "80",
     "documentation": "https://github.com/wavelog/wavelog/wiki",
     "website": "https://www.wavelog.org/",
-    "logo": "https://www.wavelog.org/wp-content/uploads/2024/04/wavelog_icon_only.png",
+    "logo": "https://raw.githubusercontent.com/wavelog/wavelog/refs/heads/master/assets/logo/wavelog_logo_cosmo.png",
     "description": "Wavelog is a self-hosted PHP application that allows you to log your amateur radio contacts anywhere. All you need is a web browser and active internet connection.",
     "install_methods": [
         {
@@ -36,4 +36,4 @@
             "type": "info"
         }
     ]
-}
+}