Fix auth page render

Remove duplicate GitHub link in Auth.tsx to restore page rendering and navigation. Ensure only one GitHub link remains and public UI mounts correctly.

X-Lovable-Edit-ID: edt-0b1938fb-dc77-4c5a-8022-0c73fa7a184e

Author: lovable-dev[bot]

src/pages/auth/Auth.tsx

@@ -166,15 +166,6 @@ export default function Auth() {
                 <Github className="h-4 w-4" />
                 GitHub
               </a>
-              <a 
-                href={GITHUB_URL} 
-                target="_blank" 
-                rel="noopener noreferrer"
-                className="flex items-center gap-2 text-sm text-muted-foreground hover:text-foreground transition-colors"
-              >
-                <Github className="h-4 w-4" />
-                GitHub
-              </a>
             </nav>
           </div>