docs: bring README, RFC/IEC62443/BDD docs back in line with code #786

Job	Run time
build-linux-gcc	55s
integration-linux-mbedtls	54s
build-linux-tunable-override	51s
integration-linux-openssl	31s
coverage-linux-gcc	52s
build-freertos-host-tdd	1m 29s
sanitize-linux-gcc	1m 21s
build-linux-clang	57s
analyze-cppcheck	1m 33s
analyze-tidy	3m 26s
analyze-iwyu	1m 8s
analyze-format	18s
build-freertos-target	48s
integration-windows-openssl	3m 11s
build-windows-msvc	1m 36s
bdd-freertos-qemu	4m 15s
deploy-coverage-pages	0s
bdd-linux-syslog-ng	1m 14s
bdd-windows-otel	1m 18s
summary	23s
	27m 0s

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