Add infrastructure for keyword documentation #10731

Job	Run time
lint_node	26s
lint_ruby	24s
build_node (ubuntu-latest)	1m 12s
build_node (macos-latest)	1m 40s
Ruby 3.1 on ubuntu-latest	14m 13s
Verify Jekyll website builds	8s
build_node (windows-latest)	6m 14s
Ruby 3.2 on ubuntu-latest	12m 9s
Ruby 3.3 on ubuntu-latest	8m 51s
Ruby 3.1 on macos-latest	8m 45s
Ruby 3.2 on macos-latest	7m 58s
Ruby 3.3 on macos-latest	5m 52s
Ruby 3.1 on windows-latest	18m 38s
Ruby 3.2 on windows-latest	18m 52s
Ruby 3.3 on windows-latest	19m 53s
	2h 5m 15s

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