remove ipynb cleanup script

remove_big_ipynb.py

@@ -1,10 +0,0 @@
-import os
-
-threshold = 5 * 1024 * 1024
-
-def blob_callback(blob, metadata):
-    if not blob.path.endswith(b'.ipynb'):
-        return
-    if len(blob.data) <= threshold:
-        return
-    blob.skip()