docs: note about updating default branch

Jacky Zhao

2023-08-20 03fd62496f94c7cc007f802fc10290581d08deb0

 quartz/components/styles/legacyToc.scss

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

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