build

docs: update readthedocs setup #3739

Job	Run time
make static	40s
build libnvme and nvme-cli separately	41s
cross (s390x)	53s
libnvme (gcc, release)	42s
cross (ppc64le)	52s
libnvme (clang, release)	49s
muon minimal static	36s
cross (armhf)	55s
libnvme (gcc, debug)	38s
nvme-cli (gcc, debug)	44s
libnvme (clang, debug)	41s
nvme-cli (gcc, release)	55s
nvme-cli (clang, debug)	47s
nvme-cli (clang, release)	53s
fallback shared libraries	0s
	10m 46s

Provide feedback