docs: Allow producing a `memray.1` man page #2717

Job	Run time
Build source distribution	19s
Decide which wheel types to build	1s
Publish docs	0s
macosx_x86_64 wheels	31m 8s
manylinux_x86_64_manylinux2010_hack wheels	13m 24s
macosx_arm64 wheels	13m 26s
musllinux_x86_64 wheels	19m 38s
manylinux_i686 wheels	19m 55s
Build and test wheels	1s
upload_pypi	0s
	1h 37m 52s

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