docs(showcase): fix pull request redirect link (#500)

Ben Schlegel

2023-09-22 d93599364a3dd0b46068826cf14ed7b25aa59fc3

 quartz/components/styles/legacyToc.scss

@@ -12,7 +12,7 @@
      margin: 0;
    }
  }
    

  & ul {
    list-style: none;
    margin: 0.5rem 1.25rem;