remove outdated docs #2012

Job	Run time
towncrier_check	57s
check_if_release_branch	1s
changed_files	55s
build mirrord	0s
check-rust-docs	50s
lint	4m 40s
integration_tests	13m 1s
lint_markdown	0s
macos_tests	21m 29s
test_agent	3m 27s
test_agent_image	6m 16s
test_cli_image	7m 9s
intellij_e2e_on_release_branch	0s
e2e (docker)	10m 17s
vscode_e2e_on_release_branch	0s
e2e (containerd)	10m 40s
ci	1s
	1h 19m 43s

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