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Revert "refactor(@angular/cli): import markdown files directly for co… #3526

Job	Run time
build-e2e-windows	41s
build	37s
lint	2m 32s
Browser Compatibility Tests	0s
test	0s
e2e-snapshots	0s
publish-snapshots	0s
e2e-package-managers	0s
e2e	0s
e2e-windows	0s
	3m 50s