docs: add hard disable job example

```

This way, all Kubernetes jobs will inherit this configuration.

### Example 3: disable go-mod-outdated job

There are a few _to be continuous_ jobs that can't be disabled.

It is the case for example of the `go-mod-outdated` job from the Golang template (actually this job is a pure manually triggered job).

Let's suppose in my project I don't want this job to appear in my pipelines.

That can be done by simply overriding the `go-mod-outdated` job rules as follows:

```yaml

include:

  - project: 'to-be-continuous/golang'

    file: '/templates/gitlab-ci-golang.yml'

    ref: '4.0.0'

# hard disable go-mod-outdated

go-mod-outdated:

  rules:

    - when: never

```

This way, the job won't never appear in the project pipeline.

This technique may be used to hard-disable any non-configurable _to be continuous_ job.