build_docs: rsync add delete flag (#89) #58

Job	Run time
macos (macos-12, auto_index contract geometry url, --debug)	1s
linux (ubuntu-latest, ubuntu:24.04, python-is-python3, auto_index geometry, --debug)	15m 32s
linux (ubuntu-latest, ubuntu:22.04, python2, auto_index geometry url, --debug)	14m 29s
linux (ubuntu-latest, ubuntu:20.04, python, auto_index geometry url, --debug)	17m 33s
macos (macos-12, contract geometry url, --debug --boostrelease)	1s
linux (ubuntu-latest, ubuntu:24.04, python-is-python3, geometry url, --debug --boostrelease)	17m 20s
windows (windows-2019, auto_index contract hana leaf log parameter parameter_python python qvm url)	1h 59m 47s
macos (macos-14, auto_index contract geometry url, --debug)	11m 0s
macos (macos-14, contract geometry url, --debug --boostrelease)	9m 5s
windows (windows-2022, auto_index contract hana log parameter parameter_python python url)	1h 59m 21s
linux (ubuntu-latest, ubuntu:22.04, python2, geometry url, --debug --boostrelease)	14m 11s
windows (windows-2019, -boostrelease, contract hana log parameter parameter_python python url)	1h 33m 8s
linux (ubuntu-latest, ubuntu:20.04, python, geometry url, --debug --boostrelease)	17m 36s
windows (windows-2022, -boostrelease, contract hana log parameter parameter_python python url)	1h 34m 55s
	9h 3m 59s

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