STYLE: Specify ReadTheDocs custom domain configuration #740

Job	Run time
build-test-documentation (ubuntu-22.04)	6h 0m 12s
build-test-cxx (ubuntu-22.04)	12m 15s
build-test-cxx (windows-2022)	11m 54s
build-test-cxx (macos-13)	1s
build-test-python-superbuild (ubuntu-22.04)	12m 13s
build-test-python-superbuild (windows-2022)	11m 53s
build-test-python-superbuild (macos-12)	1s
build-test-notebooks (ubuntu-22.04)	2m 18s
build-test-notebooks (windows-2022)	3m 43s
build-test-notebooks (macos-13)	1s
	6h 54m 31s

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