docs: add static website and docs

docs/site.js

@@ -0,0 +1,21 @@
+const copyButtons = document.querySelectorAll("[data-copy]");
+
+for (const button of copyButtons) {
+  button.addEventListener("click", async () => {
+    const targetSelector = button.getAttribute("data-copy");
+    const target = targetSelector === null ? null : document.querySelector(targetSelector);
+    const text = target?.textContent?.replace(/^\s*\$ /gm, "").trim();
+    if (!text) return;
+
+    try {
+      await navigator.clipboard.writeText(text);
+      const original = button.textContent;
+      button.textContent = "Copied";
+      window.setTimeout(() => {
+        button.textContent = original;
+      }, 1400);
+    } catch {
+      button.textContent = "Select code";
+    }
+  });
+}