website: Remove gem5 Workshop submission info

Submissions are now closed and we have our schedule set.

Change-Id: I9232481f24869bff8b028a8775e409067b3652fc
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/59890
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: Jason Lowe-Power <power.jg@gmail.com>
1 file changed