website: Add a link to the CPU models from gem5 bootcamp Change-Id: I4813ad999cc91a7e96b020c3885f019420a010cd Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/62053 Tested-by: Bobby Bruce <bbruce@ucdavis.edu> Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu> Maintainer: Bobby Bruce <bbruce@ucdavis.edu>