[Hermes Init]: Establish templating format / library #452
Description
Currently, hermes init uses its own custom templating format.
Should we switch to a more established format such as Jinja? This would allow us to use the Jinja library instead of building our own template engine and it would make it easier to extend templates in the future using a well-documented format.
It might also be a good idea to look into projects such as Python cookiecutter to draw some inspiration.