Make this template support jinja templating

[OlafConijn]

in order to

1. automate the installation of this reference architecture
2. integation with the org-formation-cli tool

I would be beneficial for this repo to support a formal templating language (e.g. Jinja).
The org-formation-cli can then use the repo-name as an option when performing init-pipeline in a similar way sls uses a --template-url (in our case maybe --template-repo?).

the replacement keys would need to be known in both the cli and this repo.

[OlafConijn]

maybe liquid.js is a better fit?

[zaro0508]

ofn will fully support templating, org-formation/org-formation-cli#202 & org-formation/org-formation-cli#252 Is there anything else that's needed for this issue?