Enable multi-level nav in the left nav bar #3243

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	1m 59s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	1m 59s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	1m 59s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	1m 57s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	1m 58s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	1m 58s
pytorch_tutorial_build_worker (7, 15, linux.4xlarge.nvidia.gpu)	1m 58s
pytorch_tutorial_build_worker (8, 15, linux.4xlarge.nvidia.gpu)	1m 58s
pytorch_tutorial_build_worker (9, 15, linux.4xlarge.nvidia.gpu)	1m 59s
pytorch_tutorial_build_worker (10, 15, linux.4xlarge.nvidia.gpu)	2m 0s
pytorch_tutorial_build_worker (11, 15, linux.4xlarge.nvidia.gpu)	2m 0s
pytorch_tutorial_build_worker (12, 15, linux.4xlarge.nvidia.gpu)	2m 0s
pytorch_tutorial_build_worker (13, 15, linux.4xlarge.nvidia.gpu)	2m 1s
pytorch_tutorial_build_worker (14, 15, linux.4xlarge.nvidia.gpu)	2m 0s
pytorch_tutorial_build_worker (15, 15, linux.4xlarge.nvidia.gpu)	2m 0s
pytorch_tutorial_build_manager	1s
	29m 47s

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