Incorporate mermaid diagrams

inst/pkgdown/assets/assets/mermaid.js

@@ -0,0 +1,7 @@
+window.addEventListener("DOMContentLoaded",()=>{document.querySelectorAll("pre.mermaid").forEach($el=>{console.log($el),($el="CODE"===$el.tagName?$el.parentElement:$el).outerHTML=`
+        <div class="mermaid">${$el.textContent}</div>
+        <details>
+          <summary>Diagram source</summary>
+          <pre>${$el.textContent}</pre>
+        </details>
+      `})}),mermaid.initialize({logLevel:"error",securityLevel:"loose",theme:window.matchMedia&&window.matchMedia("(prefers-color-scheme: dark)").matches?"dark":"default"});