chore: add footer tagline with Robin link (#22)

Change footer text from "Made with care. Open source under MIT License."
to "Made by Robin." with Robin linking to https://robinvanbaalen.nl

Co-authored-by: Claude <noreply@anthropic.com>

Author: rvanbaalen

docs/index.html

@@ -485,7 +485,7 @@ <h3 class="font-semibold text-gray-900 mb-1">Multiple Monitors</h3>
 
                 <!-- Copyright -->
                 <p class="text-sm text-gray-500">
-                    Made with care. Open source under MIT License.
+                    Made by <a href="https://robinvanbaalen.nl" target="_blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline">Robin</a>.
                 </p>
             </div>
         </div>