Tango workflow no longer needs models_dir input

Working CWL workflow

See merge request David.Sherman/tango_models!1

Default location for data/

Correct location models_dir

Output of mkdir_files is "out_dir"

.gitignore figures

tango_plots is scatter workflow that calls tango_one_plot

Call plot scripts using module

Use tango_plots for scatter. Combine outputs into directories

per-community parameters

Both simulation.py and plot_com.py look for data in data/

Transcript data in /data
- Closes Tango/tango_models#2

Remove copy of data from pipeline/

- Create pyproject.toml
- Declare Python dependencies
- Define minimal Conda environment