perf: don't load mermaid if its not on the page

Jacky Zhao

2024-02-06 34334eabed151cf5fa881d6b34f75107a2d3871e

 quartz/components/ArticleTitle.tsx

@@ -9,6 +9,7 @@
    return null
  }
}

ArticleTitle.css = `
.article-title {
  margin: 2rem 0 0 0;