Avoid /etc/foreman-installer/scenarios.d about foreman-documentation

[ekohl]

Today we have 3 cases left:

$ rg scenarios.d
guides/common/modules/proc_deploying-a-custom-ssl-certificate-to-satellite-server.adoc
80:If you are unsure which command to run, you can verify that {Project} is installed by checking if the file `/etc/foreman-installer/scenarios.d/.installed` exists.

guides/common/modules/proc_configuring-dns-dhcp-and-tftp.adoc
65:You can view the settings used, including the `initial_admin_password` parameter, in the `/etc/foreman-installer/scenarios.d/{project-context}-answers.yaml` file.

guides/doc-Planning_for_Project/topics/Glossary.adoc
16:Answer files are defined in the YAML format and stored in the */etc/foreman-installer/scenarios.d/* directory.

[maximiliankolb]

somewhat related: https://projects.theforeman.org/issues/36957