add mono mode

assets/javascript/emoji-footprint.js

@@ -1,6 +1,11 @@
 // Sparkle effect on mouse move
 document.addEventListener('mousemove', function (e) {
-    const emojis = ['✨', '💖', '🌟', '💅', '🦄', '🎉', '🌈'];
+    let emojis = ['✨', '💖', '🌟', '💅', '🦄', '🎉', '🌈'];
+    const htmlElement = document.documentElement;
+
+    if (htmlElement.getAttribute('data-website-mode') === 'mono') {
+        emojis = ['🦇', '🦹', '🌙', '⚰️', '🕯️'];
+    }
     const sparkle = document.createElement('div');
     sparkle.className = 'emoji-footprint';
     sparkle.textContent = emojis[Math.floor(Math.random() * emojis.length)];