docs: make role of getQuartzComponents more clear and also make it optional

Jacky Zhao

2025-03-06 2213424195b6ba761a6bf3343afca43b102d06b3

 quartz/components/renderPage.tsx

@@ -54,6 +54,7 @@
      },
      ...staticResources.js,
    ],
    additionalHead: staticResources.additionalHead,
  }

  if (fileData.hasMermaidDiagram) {