website: Add 'gem5-22.1 Released!' blog post

Change-Id: I30261c4c7c795078bd29f714c953b3cf2a6a5970
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/67174
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby Bruce <bbruce@ucdavis.edu>
1 file changed