MAINT: removal of the outdated nrao module

Author: bsipocz

CHANGES.rst

@@ -150,6 +150,10 @@ Infrastructure, Utility and Other Changes and Additions
 - New function, ``utils.cleanup_downloads.cleanup_saved_downloads``, is
   added to help the testcleanup narrative in narrative documentations. [#2384]
 
+- Removal of the non-functional ``nrao`` module as it was completely
+  uncompatible with the refactored upstream API. [#2546]
+
+
 
 0.4.6 (2022-03-22)
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