chore(showcase): Add Assortment to site showcase (#13002)
chore(showcase): Add Assortment to site showcase (#13002)

## Description

Adding [assortment.io](https://assortment.io) to site showcase. Assortment is my Web Development blog that I've recently updated to Gatsby, Netlify, Netlify CMS and Emotion. It'd be cool to see it on the showcase 😃
gatsbyjs/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby