docs: Adds back Xinyang's cs garden to showcase (#1323)

Xinyang Yu

2024-08-09 12904ab7960edc3bedd77c65cf5e6a5d599d882d

 quartz/plugins/transformers/frontmatter.ts

@@ -90,6 +90,7 @@
        description: string
        publish: boolean
        draft: boolean
        lang: string
        enableToc: string
        cssclasses: string[]
      }>