Feature: add ansible-vault and provide information how to use with AN

[ableischwitz]

Description

Ansible vaults provide a means of securing sensitive information and credentials. This pull request provides information how to make use of an Ansible-vault in combination with Ansible-Navigatior

Checklist/ToDo's

• [X] Added documentation?
• [X] Added release note entry? ( docs/release-notes.md )
• [X] Tested?

[rbo]

/ok-to-test