Ansible -- Hosts file contains vars / secrets

`ansible/hosts.example` contains example secrets and vars that would be stored in the gitignored `hosts` file.

Actual secrets should be stored using `ansible-vault` and a vaultkey, the vaultkey is gitignored and `secrets.yml` would contain the secrets. Example: `ansible/group_vars/web/secrets.yml`.

Start with ansible/hosts.example and compare its variables with the example at ansible/group_vars/web/secrets.yml. Remove example secrets and vars from the hosts example so sensitive values are represented through the stated ansible-vault and vaultkey setup, then verify no secrets remain in the example file.

Written by the indexing model from the issue text.