remove checkout step from instructions as v4 is the default branch

Jacky Zhao

2023-08-20 425c9789a451e69adbba2d99193e38e8915e8804

 quartz/styles/base.scss

@@ -320,7 +320,6 @@
  border-radius: 5px;
  overflow-x: auto;
  border: 1px solid var(--lightgray);
  position: relative;

  &:has(> code.mermaid) {
    border: none;