[BUG] Documentation uses deprecated commands

[jsakas]

Bug Description

All documentation and example code references auth0 ul customize ... commands which are deprecated

Running the latest version of the auth0 CLI, we see:

� DEPRECATION WARNING: Advanced Customizations (ACUL) have moved!

The 'auth0 ul customize --rendering-mode advanced' functionality will be
DEPRECATED on June 15, 2026. Please migrate to the new ACUL commands:

  ✅ auth0 acul config generate|get|set|list|docs

Standard Universal Login customizations continue to work as before.