fix: mermaid rendering broken after rehype-pretty-code bump (closes #638)

Jacky Zhao

2023-12-19 443cd53a1acf33ac0aaa34e0e75760d3da912d18

 quartz/styles/base.scss

@@ -333,7 +333,7 @@
  overflow-x: auto;
  border: 1px solid var(--lightgray);

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