Remove 'Built with Astro' from footer

Co-authored-by: waldekmastykarz <11164679+waldekmastykarz@users.noreply.github.com>

Author: Copilot

package-lock.json

@@ -100,7 +100,7 @@ const { title, description = 'Dev Proxy - Simulate API behaviors for testing and
 
     <footer class="border-t py-8 mt-16" style="border-color: var(--border-primary);">
       <div class="max-w-6xl mx-auto px-4 text-center text-sm" style="color: var(--text-faint);">
-        <p>&copy; {new Date().getFullYear()} Dev Proxy. Built with <a href="https://astro.build" class="text-purple-400 hover:text-purple-300" target="_blank" rel="noopener">Astro</a>.</p>
+        <p>&copy; {new Date().getFullYear()} Dev Proxy.</p>
       </div>
     </footer>