feat(search): add arrow key navigation (#442)

Ben Schlegel

2023-09-03 7e42be8e46501c752dda9bd174fb93ea9dccec22

 quartz/components/styles/legacyToc.scss

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

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