Update S3 HTML indices for download.pytorch.org

Update S3 HTML indices for download.pytorch.org #1010

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Run time

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Job	Run time
update (whl/test)	1m 36s
update (libtorch/nightly)	2m 39s
update (whl)	1m 39s
update (whl/nightly)	1m 57s
update (libtorch)	2m 21s
update (whl/preview/forge)	2m 2s
update (source_code/test)	2m 10s
	14m 24s