replace project.entry-points.console_scripts with project.scripts

[lonnen]

The pyproject.toml specification says:

Build back-ends MUST raise an error if the metadata defines a [project.entry-points.console_scripts] or [project.entry-points.gui_scripts] table, as they would be ambiguous in the face of [project.scripts] and [project.gui-scripts], respectively.

This replaces the entrypoint with projects.scripts, as suggested in Writing your pyproject.toml article on python.org.