NGINX LDAP Architecture image in README isn't loading

Issue: The NGINX LDAP Architecture image in the [README](https://github.com/nginxinc/nginx-ldap-auth/blob/master/README.md) isn't working.

![Image](https://github.com/user-attachments/assets/513b657a-b18c-40a1-9013-60f2c6405d82)