Add Zola templates and browser-tested site scaffold

static/post.js

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+import mermaid from "/vendor/mermaid/mermaid.esm.min.mjs";
+
+const diagrams = document.querySelectorAll('pre code[data-lang="mermaid"]');
+
+for (const code of diagrams) {
+  const diagram = document.createElement("div");
+  diagram.className = "mermaid";
+  diagram.textContent = code.textContent;
+  code.parentElement.replaceWith(diagram);
+}
+
+mermaid.initialize({
+  startOnLoad: false,
+  theme: "neutral",
+  fontFamily: "Comic Neue",
+});
+await mermaid.run();
+
+window.MathJax = {
+  loader: { paths: { fonts: "/vendor/fonts" } },
+  output: { font: "mathjax-fira" },
+  chtml: { matchFontHeight: false },
+};
+
+const script = document.createElement("script");
+script.src = "/vendor/mathjax/tex-chtml-nofont.js";
+document.head.append(script);