Add sphinx-redirect extension #4618

Job	Run time
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	41m 49s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	19m 20s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	24m 20s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	19m 10s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	32m 36s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	16m 51s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	18m 44s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	25m 9s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	17m 27s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	17m 47s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	25m 52s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	37m 50s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	16m 24s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	29m 45s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	16m 40s
pytorch_tutorial_build_manager	23m 43s
	6h 23m 27s

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