chore: remove deprecation notice, fix ingress.annotations doc

# GitLab's Auto-deploy Helm Chart

## Deprecation Notice

GitLab is moving all development for `auto-deploy-app` into [`auto-deploy-image`](https://gitlab.com/gitlab-org/cluster-integration/auto-deploy-image). 

Going forward, the `auto-deploy-app` Helm chart will be bundled with `auto-deploy-image`

and will no longer released as a stand-alone Helm chart. Existing releases of `auto-deploy-app`

will remain in [GitLab's chart registry](http://charts.gitlab.io/).

If you have any questions, please ask in <https://gitlab.com/gitlab-org/charts/auto-deploy-app/-/issues/70>.

## Requirements

- Helm `2.9.0` and above is required in order support `"helm.sh/hook-delete-policy": before-hook-creation` for migrations

| ingress.modSecurity.enabled | Enable custom configuration for modsecurity, defaulting to [the Core Rule Set](https://coreruleset.org) | `false` |

| ingress.modSecurity.secRuleEngine | Configuration for [ModSecurity's rule engine](https://github.com/SpiderLabs/ModSecurity/wiki/Reference-Manual-(v2.x)#SecRuleEngine) | `DetectionOnly` |

| ingress.modSecurity.secRules | Configuration for custom [ModSecurity's rules](https://github.com/SpiderLabs/ModSecurity/wiki/Reference-Manual-(v2.x)#secrule) | `nil` |

| ingress.annotations           | Ingress annotations | `{kubernetes.io/tls-acme: "true", kubernetes.io/ingress.class: "nginx"}` |

| ingress.annotations           | Ingress annotations | `{kubernetes.io/ingress.class: "nginx"}` |

| livenessProbe.path            | Path to access on the HTTP server on periodic probe of container liveness. | `/`                                |

| livenessProbe.scheme          | Scheme to access the HTTP server (HTTP or HTTPS). | `HTTP`                                |

| livenessProbe.initialDelaySeconds | # of seconds after the container has started before liveness probes are initiated. | `15`                               |