website: Fixed gem5art blog link

Change-Id: Ifeaa8f3b368dee8993da4fe563a932882bf55473
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/29824
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby R. Bruce <bbruce@ucdavis.edu>
diff --git a/_posts/2020-05-26-gem5art.md b/_posts/2020-05-26-gem5art.md
index 6fa7781..25a1a58 100644
--- a/_posts/2020-05-26-gem5art.md
+++ b/_posts/2020-05-26-gem5art.md
@@ -3,7 +3,6 @@
 title:  "gem5art announcement"
 author: Hoa Nguyen
 date:   2020-05-26
-categories: project
 ---
 
 ![gem5art-logo](/assets/img/blog/gem5art.svg)