remove stale islamiccompanion.json (rejected in #52309, causes test failure)

domains/islamiccompanion.json

@@ -1,11 +0,0 @@
-{
-  "description": "Islamic Companion - prayer times, Quran reader, Qibla compass, duas & more",
-  "owner": {
-    "username": "linkg540-coder",
-    "email": "313203301+linkg540-coder@users.noreply.github.com"
-  },
-  "records": {
-    "CNAME": "linkg540-coder.github.io"
-  },
-  "proxied": false
-}