Enable multi-level nav in the left nav bar #3248

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	15m 1s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	51m 25s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	19m 26s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	27m 41s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	19m 33s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	29m 33s
pytorch_tutorial_build_worker (7, 15, linux.4xlarge.nvidia.gpu)	31m 31s
pytorch_tutorial_build_worker (8, 15, linux.4xlarge.nvidia.gpu)	28m 55s
pytorch_tutorial_build_worker (9, 15, linux.4xlarge.nvidia.gpu)	23m 7s
pytorch_tutorial_build_worker (10, 15, linux.4xlarge.nvidia.gpu)	30m 36s
pytorch_tutorial_build_worker (11, 15, linux.4xlarge.nvidia.gpu)	13m 53s
pytorch_tutorial_build_worker (12, 15, linux.4xlarge.nvidia.gpu)	17m 31s
pytorch_tutorial_build_worker (13, 15, linux.4xlarge.nvidia.gpu)	17m 44s
pytorch_tutorial_build_worker (14, 15, linux.4xlarge.nvidia.gpu)	14m 3s
pytorch_tutorial_build_worker (15, 15, linux.4xlarge.nvidia.gpu)	16m 6s
pytorch_tutorial_build_manager	0s
	5h 56m 5s

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