Reformat as a python package with an executable script

Probably should have:

- [ ] an interactive CLI
- [ ] ability to specify Postgres connection configuration file
- [ ] ability to delete database and create new one following the [schema](https://github.com/BONSAMURAIS/schema/)

Start by inspecting the repository's current shell implementation and how it is invoked. Define the package and executable entry point, then trace the requested CLI options, Postgres configuration file handling, and database recreation against the linked schema; done means all three checklist items work together.

Written by the indexing model from the issue text.