fix: 修復網站壓縮後，mermaid 會無法生成顯示的Bugs

feat： Valine 增加 option 設置

layout/includes/third-party/math/mathjax.pug

@@ -41,7 +41,7 @@ script.
       }
     }
     
-    var script = document.createElement('script')
+    const script = document.createElement('script')
     script.src = '!{theme.CDN.mathjax}'
     script.id = 'MathJax-script'
     script.async = true