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

Aster Hu

2024-02-22 916aedce40864a485724d9df78879e8d130beab3

 quartz/styles/base.scss

@@ -53,8 +53,12 @@
  }
}

strong {
  font-weight: $semiBoldWeight;
}

a {
  font-weight: $boldWeight;
  font-weight: $semiBoldWeight;
  text-decoration: none;
  transition: color 0.2s ease;
  color: var(--secondary);