docs: make setting upstream more clear, docs on npx quartz restore

Jacky Zhao

2023-08-20 d205eb568686a718cae889d51fde5ae18d352b30

 quartz/styles/base.scss

@@ -444,7 +444,7 @@
ul.overflow,
ol.overflow {
  height: 300px;
  overflow-y: scroll;
  overflow-y: auto;

  // clearfix
  content: "";