docs: nginx rewrite conflict with RedirectAdminMiddleware

[Laplace-Transformer]

Removed removal of nginx rewrite. Conflicted with "RedirectAdminMiddleware" in the kratos code, which adds the prefix "admin/" if not present.

Related Issue or Design Document

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability.
  If this pull request addresses a security vulnerability,
  I confirm that I got approval (please contact security@ory.sh) from the maintainers to push the changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added the necessary documentation within the code base (if appropriate).

Further comments

[CLAassistant]

All committers have signed the CLA.

[aeneasr]

To merge this we would probably need to run through this example step by step, unless there is a clear reason why this was in there for so long and noone ever noticed it / complained about it?

[Laplace-Transformer]

Hi again.
There was a breaking change back in 2022, that you introduced:
ory/kratos@8acb4cf

I don't think many people use this documentation. I've tried to follow it but I've had few hiccups on the way that I'm currently trying to correct.