website: Add HPCA '23 gem5 Tutorial event

Change-Id: Ifb26b6f27a0d46915c1bbce61b1cfa62a06d3a8a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/65711
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
2 files changed