better concurrency debugging, --concurrency flag for npx quartz build

Jacky Zhao

2023-08-09 49bd6bc3ffe1d3507e00bae62c12d9b045363090

 quartz/components/styles/darkmode.scss

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

  & > .toggle {
    display: none;