build

docs: update readthedocs setup #3740

Job	Run time
cross (armhf)	45s
fallback shared libraries	1m 40s
nvme-cli (clang, debug)	49s
nvme-cli (clang, release)	52s
make static	45s
nvme-cli (gcc, debug)	52s
cross (ppc64le)	45s
cross (s390x)	39s
libnvme (gcc, release)	49s
libnvme (clang, debug)	39s
libnvme (gcc, debug)	45s
libnvme (clang, release)	43s
nvme-cli (gcc, release)	52s
muon minimal static	39s
build libnvme and nvme-cli separately	38s
	12m 12s

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