fix(layout): Add cross-origin prototype for Mermaid renderer import (#85)

Author: xihale

layouts/post.shtml

@@ -11,7 +11,7 @@
     <script defer src="https://mirrors.sustech.edu.cn/cdnjs/ajax/libs/KaTeX/0.15.2/contrib/auto-render.min.js" integrity="sha512-ZA/RPrAo88DlwRnnoNVqKINnQNcWERzRK03PDaA4GIJiVZvGFIWQbdWCsUebMZfkWohnfngsDjXzU6PokO4jGw==" crossorigin="anonymous" onload="renderMathInElement(document.body);"></script>
   </ctx>
   <ctx :if="$page.custom.getOr('mermaid', false)">
-    <script defer src="https://mirrors.sustech.edu.cn/cdnjs/ajax/libs/mermaid/8.14.0/mermaid.min.js" integrity="sha512-vLumCjg7NKEQKGM+xAgBYTvQ90DVu6Eo7vS1T/iPf2feNLcrpGxvumuUUmE3CPiCUPgviyKbtpWGDbhnVnmJxg==" onload="mermaid.initialize({startOnLoad:true});"></script>
+    <script defer src="https://mirrors.sustech.edu.cn/cdnjs/ajax/libs/mermaid/8.14.0/mermaid.min.js" integrity="sha512-vLumCjg7NKEQKGM+xAgBYTvQ90DVu6Eo7vS1T/iPf2feNLcrpGxvumuUUmE3CPiCUPgviyKbtpWGDbhnVnmJxg==" crossorigin="anonymous" onload="mermaid.initialize({startOnLoad:true});"></script>
   </ctx>
 </head>
 <div id="content">