website: Fix broken links for the HPCA '23 Tutorial

Change-Id: I1b27fc92b38eb425aac7c344d9a91a2605159c26
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/69217
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby Bruce <bbruce@ucdavis.edu>
3 files changed