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

Jacky Zhao

2023-08-20 d205eb568686a718cae889d51fde5ae18d352b30

 quartz/components/styles/darkmode.scss

@@ -2,6 +2,7 @@
  position: relative;
  width: 20px;
  height: 20px;
  margin: 0 10px;

  & > .toggle {
    display: none;