website/docs: add notice for nginx ingress configuration requirement (#7027)

* website/docs: add notice for nginx ingress configuration requirement

https://github.com/goauthentik/infrastructure/pull/574
Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* Update website/docs/providers/proxy/_nginx_ingress.md

Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>
Signed-off-by: Jens L. <jens@beryju.org>

---------

Signed-off-by: Jens Langhammer <jens@goauthentik.io>
Signed-off-by: Jens L. <jens@beryju.org>
Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>
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@ -24,6 +24,10 @@ This ingress handles authentication requests, and the sign-in flow.
Add these annotations to the ingress you want to protect
:::warning
This configuration requires that you enable [`allow-snippet-annotations`](https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/#allow-snippet-annotations), for example by setting `controller.allowSnippetAnnotations` to `true` in your helm values for the ingress-nginx installation.
:::
```yaml
metadata:
annotations: