Add sphinx-redirect extension #4580

Job	Run time
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	40m 59s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	16m 32s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	22m 18s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	16m 25s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	28m 52s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	15m 7s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	19m 50s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	18m 0s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	18m 22s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	31m 37s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	17m 34s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	35m 42s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	24m 24s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	23m 24s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	17m 11s
pytorch_tutorial_build_manager	22m 59s
	6h 9m 16s

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