Migrate signature help to Rubydex #16906

Job	Run time
build_node (macos-latest)	2m 34s
lint_node	33s
Ruby 4.0 on windows-latest	20m 41s
Ruby 3.3 on windows-latest	20m 37s
Ruby 3.3 on macos-latest	7m 50s
Ruby 3.4 on windows-latest	19m 8s
Verify Jekyll website builds	8s
Ruby 3.3 on ubuntu-latest	8m 19s
lint_ruby	26s
Ruby 3.4 on macos-latest	5m 1s
Ruby 4.0 on macos-latest	6m 19s
build_node (ubuntu-latest)	2m 33s
Ruby 3.4 on ubuntu-latest	8m 27s
build_node (windows-latest)	4m 19s
Ruby 4.0 on ubuntu-latest	7m 20s
	1h 54m 15s

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