revamp code highlighting

assets/js/copy-to-clipboard.js

@@ -0,0 +1,20 @@
+const blockcodes = document.querySelectorAll(".chroma code[data-lang]");
+
+for (const bc of blockcodes) {
+  const parent = bc.parentElement;
+  const content = bc.innerText.split("\n").filter(Boolean).join("\n");
+  const cpbutton = document.createElement("button");
+  cpbutton.classList.add("copy-button");
+  cpbutton.innerText = "Copy";
+
+  cpbutton.addEventListener("click", () => {
+    cpbutton.innerText = "Copied";
+    setTimeout(() => {
+      cpbutton.innerText = "Copy";
+    }, 1000);
+
+    navigator.clipboard.writeText(content);
+  });
+
+  parent.prepend(cpbutton);
+}