docs: Add Aster's notebook to showcase.md (#912)

Aster Hu

2024-02-22 916aedce40864a485724d9df78879e8d130beab3

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import { QuartzFilterPlugin } from "../types"
 
export const ExplicitPublish: QuartzFilterPlugin = () => ({
  name: "ExplicitPublish",
  shouldPublish(_ctx, [_tree, vfile]) {
    return vfile.data?.frontmatter?.publish ?? false
  },
})