website: Fix deadlinks

Change-Id: Ia810462f2bf58e71a050877158c960c17c6a2161
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/60010
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby Bruce <bbruce@ucdavis.edu>
10 files changed