Build_docs: more asciidoctor gems #29

Job	Run time
linux (ubuntu-latest, ubuntu:22.04, python2, auto_index)	1h 1m 29s
windows (windows-2019)	2h 4m 17s
linux (ubuntu-latest, ubuntu:20.04, python, auto_index)	1h 4m 30s
macos (macos-11, auto_index contract)	2h 29m 27s
windows (windows-2022)	1h 59m 48s
linux (ubuntu-latest, ubuntu:22.04, python2, --boostrelease)	51m 22s
macos (macos-11, contract, --boostrelease)	1h 56m 59s
windows (windows-2019, -boostrelease)	1h 42m 11s
linux (ubuntu-latest, ubuntu:20.04, python, --boostrelease)	54m 24s
macos (macos-12, auto_index contract)	1h 44m 13s
windows (windows-2022, -boostrelease)	1h 31m 24s
macos (macos-12, contract, --boostrelease)	1h 22m 18s
	18h 42m 22s

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