add dark mode support

Author: 7zeb

tos.html

@@ -63,5 +63,6 @@ <h2>About the CSS</h2>
     <footer>
         <p>© 2025 Rutwik Stuff Branding Umbrella | This website is <a href="https://www.github.io/7zeb/website">open-source</a></p>
     </footer>
+        <script src="/dark.js"></script>
 </body>
 </html>