Prevent floating point imprecision in rotation

Clamp the rotation value to less than 2*pi so that it doesn't start
getting less precise (and eventually overflowing!) as the rotation is
increased during the session.

frontend/src/ts/logo.ts

···
 
   if (text) {
     text.rotation.y += elapsed * 0.006;
+    text.rotation.y %= 2 * Math.PI;
   }
 
   renderer.render(scene, camera);