Add infrastructure for keyword documentation #10732

Job	Run time
build_node (ubuntu-latest)	1m 14s
build_node (macos-latest)	1m 7s
Ruby 3.1 on ubuntu-latest	12m 49s
build_node (windows-latest)	5m 51s
Ruby 3.2 on ubuntu-latest	12m 58s
Ruby 3.3 on ubuntu-latest	9m 46s
lint_node	35s
Ruby 3.1 on macos-latest	8m 4s
Ruby 3.2 on macos-latest	8m 35s
lint_ruby	24s
Ruby 3.3 on macos-latest	7m 40s
Verify Jekyll website builds	7s
Ruby 3.1 on windows-latest	18m 54s
Ruby 3.2 on windows-latest	19m 7s
Ruby 3.3 on windows-latest	17m 23s
	2h 4m 34s

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