website: Add specific workshop date to ISCA '23

This change also fixes some Markdown formatting.

Change-Id: I8187608491b5a05de065237336500ccba4f37bcf
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/68678
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby Bruce <bbruce@ucdavis.edu>
1 file changed