feat: update mermaid shortcode

assets/js/mermaid.js

@@ -3,8 +3,6 @@ var config = {
   fontFamily: '"Jost", -apple-system, blinkmacsystemfont, "Segoe UI", roboto, "Helvetica Neue", arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";',
 };
 
-/* eslint-disable no-undef */
-
-mermaid.initialize(config);
-
-/* eslint-enable no-undef */
+document.addEventListener('DOMContentLoaded', () => {
+  mermaid.initialize(config);
+});