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

Jacky Zhao

2024-02-06 34334eabed151cf5fa881d6b34f75107a2d3871e

 quartz/plugins/index.ts

@@ -30,5 +30,6 @@
  interface DataMap {
    slug: FullSlug
    filePath: FilePath
    relativePath: FilePath
  }
}