refactor(katex): extract config to separate script

Author: xihale

layouts/post.shtml

@@ -8,7 +8,19 @@
       integrity="sha512-LQNxIMR5rXv7o+b1l8+N1EZMfhG7iFZ9HhnbJkTp4zjNr5Wvst75AqUeFDxeRUa7l5vEDyUiAip//r+EFLLCyA=="
       crossorigin="anonymous"
     ></script>
-    <script defer src="https://mirrors.sustech.edu.cn/cdnjs/ajax/libs/KaTeX/0.16.9/contrib/auto-render.min.js" integrity="sha512-iWiuBS5nt6r60fCz26Nd0Zqe0nbk1ZTIQbl3Kv7kYsX+yKMUFHzjaH2+AnM6vp2Xs+gNmaBAVWJjSmuPw76Efg==" crossorigin="anonymous" onload="renderMathInElement(document.body, {delimiters: [{left: '$$', right: '$$', display: true}, {left: '$', right: '$', display: false}, {left: '\\(', right: '\\)', display: false}, {left: '\\[', right: '\\]', display: true}]});"></script>
+    <script>
+      function renderKaTeX() {
+        renderMathInElement(document.body, {
+          delimiters: [
+            {left: '$$', right: '$$', display: true},
+            {left: '$', right: '$', display: false},
+            {left: '\\(', right: '\\)', display: false},
+            {left: '\\[', right: '\\]', display: true}
+          ]
+        });
+      }
+    </script>
+    <script defer src="https://mirrors.sustech.edu.cn/cdnjs/ajax/libs/KaTeX/0.16.9/contrib/auto-render.min.js" integrity="sha512-iWiuBS5nt6r60fCz26Nd0Zqe0nbk1ZTIQbl3Kv7kYsX+yKMUFHzjaH2+AnM6vp2Xs+gNmaBAVWJjSmuPw76Efg==" crossorigin="anonymous" onload="renderKaTeX()"></script>
   </ctx>
   <ctx :if="$page.custom.getOr('mermaid', false)">
     <script defer src="https://mirrors.sustech.edu.cn/cdnjs/ajax/libs/mermaid/11.12.0/mermaid.min.js" integrity="sha512-5TKaYvhenABhlGIKSxAWLFJBZCSQw7HTV7aL1dJcBokM/+3PNtfgJFlv8E6Us/B1VMlQ4u8sPzjudL9TEQ06ww==" crossorigin="anonymous" onload="mermaid.initialize({theme: window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'default'}); mermaid.run();"></script>