finish up the atom news feed API

app/src/lib/util.js

@@ -0,0 +1,16 @@
+function click() {
+  let audio = new Audio("/click.wav");
+  audio.play();
+}
+
+let colors_pos = -1;
+const colors = ["yellow", "cyan", "green", "pinkish", "red", "blue"];
+
+function color() {
+  if (colors_pos < 0) colors_pos = Math.floor(Math.random() * colors.length);
+  else if (colors_pos >= colors.length) colors_pos = 0;
+
+  return colors[colors_pos];
+}
+
+export { click, color };