chore(showcase): Add StateOfCSS website (#14764)
chore(showcase): Add StateOfCSS website (#14764)

* chore(showcase): Add StateOfCSS website

* Update docs/sites.yml

Co-Authored-By: Ward Peeters <f7d6f8166205aa91930091f422c0634df8a7ceb4@coding-tech.com>

ChristopherBiscardi/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby