remove deprecated qmk json-keymap (#11823)

lib/python/qmk/cli/__init__.py

@@ -19,7 +19,6 @@ from . import flash
 from . import generate
 from . import hello
 from . import info
-from . import json
 from . import json2c
 from . import lint
 from . import list

lib/python/qmk/cli/json/__init__.py

@@ -1,5 +0,0 @@
-"""QMK CLI JSON Subcommands
-
-We list each subcommand here explicitly because all the reliable ways of searching for modules are slow and delay startup.
-"""
-from . import keymap

lib/python/qmk/cli/json/keymap.py

@@ -1,16 +0,0 @@
-"""Generate a keymap.c from a configurator export.
-"""
-from pathlib import Path
-
-from milc import cli
-
-
-@cli.argument('-o', '--output', arg_only=True, type=Path, help='File to write to')
-@cli.argument('-q', '--quiet', arg_only=True, action='store_true', help="Quiet mode, only output error messages")
-@cli.argument('filename', arg_only=True, help='Configurator JSON file')
-@cli.subcommand('Creates a keymap.c from a QMK Configurator export.', hidden=True)
-def json_keymap(cli):
-    """Renamed to `qmk json2c`.
-    """
-    cli.log.error('This command has been renamed to `qmk json2c`.')
-    return False