This reverts commit f10f33f3.

- update advice on 'forking workflow' since this is only valid for
  those with a code.usgs.gov account
- emphsize `pyproject.toml` and `poetry` as dependency tracking tools
- update `Developer Tools` section to describe how `poetry` and
  poetthepoet are used to run linting, unit tests, and audits

The file is entirely about command line interface anyway.

Update examples in usage.md to use recommended URL template formatting and add Windows command example.