Add index troubleshooting steps #10694

Job	Run time
build_node (ubuntu-latest)	1m 21s
build_node (macos-latest)	1m 38s
build_node (windows-latest)	4m 1s
Ruby 3.1 on ubuntu-latest	12m 51s
Ruby 3.2 on ubuntu-latest	12m 54s
Ruby 3.3 on ubuntu-latest	10m 23s
Ruby 3.1 on macos-latest	8m 47s
Ruby 3.2 on macos-latest	7m 34s
lint_node	33s
Ruby 3.3 on macos-latest	6m 6s
Ruby 3.1 on windows-latest	17m 45s
lint_ruby	21s
Ruby 3.2 on windows-latest	16m 16s
Ruby 3.3 on windows-latest	18m 0s
Verify Jekyll website builds	12s
	1h 58m 42s

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