bugfix: pyproject.toml needed some attention

[JnyJny]

• The scripts entry point referenced the wrong thing in main, switched from "main" to "cli". The typer decorated functions shouldn't be called directly.
• The pytest dev dependency entry was missing a version
• Added the pytest ini options defining a slow mark
• Removed requirements.txt
• Removed requirements_dev.txt
• Removed pyproject.bak
• Started tracking changes to poetry.local

Tests pass.