Show non-deprecated subcommands on main help screen, deprecate channel #489

Job	Run time
Lint (Python 3.10 on ubuntu-latest)	1m 4s
Test (Python 3.8 on macos-latest)	53s
Test (Python 3.9 on macos-latest)	52s
Test (Python 3.10 on macos-latest)	1m 6s
Test (Python 3.11 on macos-latest)	57s
Test (Python 3.12 on macos-latest)	58s
Test (Python 3.8 on ubuntu-latest)	43s
Test (Python 3.9 on ubuntu-latest)	48s
Test (Python 3.10 on ubuntu-latest)	48s
Test (Python 3.11 on ubuntu-latest)	48s
Test (Python 3.12 on ubuntu-latest)	43s
Test (Python 3.8 on windows-latest)	3m 20s
Test (Python 3.9 on windows-latest)	3m 2s
Test (Python 3.10 on windows-latest)	2m 53s
Test (Python 3.11 on windows-latest)	2m 53s
Test (Python 3.12 on windows-latest)	3m 11s
	24m 59s

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