ActivityPub: disable polling! 🤞

for #978

cron.yaml

@@ -2,12 +2,12 @@
 # docs: https://cloud.google.com/appengine/docs/standard/python3/scheduling-jobs-with-cron-yaml
 
 cron:
-- description: ATProto poll posts
-  url: /queue/atproto-poll-posts
-  schedule: every 1 minutes
-  target: default
+# - description: ATProto poll posts
+#   url: /queue/atproto-poll-posts
+#   schedule: every 1 minutes
+#   target: default
 
-- description: ATProto poll notifications
-  url: /queue/atproto-poll-notifs
-  schedule: every 1 minutes
-  target: default
+# - description: ATProto poll notifications
+#   url: /queue/atproto-poll-notifs
+#   schedule: every 1 minutes
+#   target: default