Add sphinx-redirect extension #4600

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	16m 47s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	41m 34s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	23m 47s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	37m 1s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	19m 7s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	33m 10s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	24m 55s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	16m 34s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	18m 36s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	18m 40s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	17m 57s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	20m 40s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	18m 56s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	36m 6s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	25m 22s
pytorch_tutorial_build_manager	23m 20s
	6h 32m 32s

Provide feedback