Make committed templates the norm

After a long discussion with @fosdev I came the realization that the automagical creation of configuration templates are runtime was a misfeature, which added unnecessary complexity and confusion and that @jcarres-mdsol was correct all along. This pull request is a first step in backing out the old behaviour.

The primary changes here are to make `.dice` the *only* file extension for configuration templates and stop the `config:all` rake task call the `config:generate_all` task. The documentation is changed in line and now implyies the need to commit configuration templates. The old behaviour is maintained for now as I need to give time to people currently using DiceBag like @HonoreDB and @dhoizner-mdsol to adapt.