Add sphinx-redirect extension #4606

Job	Run time
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	18m 27s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	21m 40s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	24m 43s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	36m 21s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	18m 54s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	41m 20s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	18m 19s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	26m 6s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	33m 18s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	16m 17s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	23m 38s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	19m 6s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	32m 55s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	16m 30s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	17m 43s
pytorch_tutorial_build_manager	23m 11s
	6h 28m 28s

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