Remove release note draft file

Since we've started the new changelog & release notes process, the file
for drafting release notes for the version-to-be is no longer needed.

doc/arm/notes.rst

@@ -40,8 +40,6 @@ information about each release, and source code.
 
 .. include:: ../notes/notes-known-issues.rst
 
-.. include:: ../notes/notes-current.rst
-
 .. _relnotes_license:
 
 License

doc/notes/notes-current.rst

@@ -1,45 +0,0 @@
-.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
-..
-.. SPDX-License-Identifier: MPL-2.0
-..
-.. This Source Code Form is subject to the terms of the Mozilla Public
-.. License, v. 2.0.  If a copy of the MPL was not distributed with this
-.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
-..
-.. See the COPYRIGHT file distributed with this work for additional
-.. information regarding copyright ownership.
-
-Notes for BIND 9.21.0
----------------------
-
-Security Fixes
-~~~~~~~~~~~~~~
-
-- None.
-
-New Features
-~~~~~~~~~~~~
-
-- None.
-
-Removed Features
-~~~~~~~~~~~~~~~~
-
-- None.
-
-Feature Changes
-~~~~~~~~~~~~~~~
-
-- None.
-
-Bug Fixes
-~~~~~~~~~
-
-- None.
-
-Known Issues
-~~~~~~~~~~~~
-
-- There are no new known issues with this release. See :ref:`above
-  <relnotes_known_issues>` for a list of all known issues affecting this
-  BIND 9 branch.