Option to Disable Public *.mintlify.app Domain

[czeizel]

I’d like to propose a feature that would significantly improve security and access control for documentation projects.

Currently, even when using a custom domain, the default *.mintlify.app domain remains publicly accessible. This creates a problem for setups where documentation is intended to be private or protected, for example, when served behind tools like Cloudflare Access.

In our case, we are using the free tier and hosting docs behind access control on a custom domain, but the Mintlify subdomain still exposes the same content publicly, effectively bypassing those restrictions.

Request:
Introduce an option to disable or restrict access to the default *.mintlify.app domain.

Why this matters:

• Prevents unintended public exposure of documentation
• Enables secure/private documentation setups
• Aligns with common practices for custom domain ownership and access control

Additional context:
If this feature is only planned for paid tiers, it would still be helpful to know, although in our case, upgrading is not an option at the moment, so a free-tier-compatible solution or workaround would be especially valuable.

Thanks for considering this -- happy to provide more details if needed!