setup: update support link

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

templates/webadmin/adminsetup.html

@@ -100,7 +100,7 @@ explicit grant from the SFTPGo Team (support@sftpgo.com).
     </div>
     {{- if not .HideSupportLink}}
     <div class="d-flex fw-semibold text-primary">
-        <a href="https://github.com/drakkan/sftpgo#sponsors" target="_blank" class="px-2">
+        <a href="https://github.com/drakkan/sftpgo?tab=readme-ov-file#sponsors" target="_blank" class="px-2">
             <span data-i18n="setup.help_text"></span>
         </a>
     </div>