Post-merge cleaning

[energyLS]

List:

• Remove workflow/notebooks/_helpers.py and refer to the single workflow/scripts/_helpers.py from the notebooks
• bring back electricity_steel_ratio and embodied_energy_steel (necessary for notebooks, may be changed in future)
• Remove snakemake function def _wacc_for_region(region) and replace with wacc rule
• workflow/notebooks/conceptual-model.ipynb was deleted, bring it back if necessary -> Leon will bring it back
• Load input files on Zenodo and automize download

[energyLS]

Proposed further proceedings, @JanTautorus what do you think?

• 1. Jan: Test dev branch on your machine with model_trade_all
• 2. Jan: fix solving issue steel (infeasible)
• 3. Leon: upload input data to zenodo
• 4. Leon: doublecheck PyPSA network HBI with low and high demands. Hint: check unreserved runs // Hint: https://github.com/energyLS/shift/blob/main/config/config.yaml#L135-L136
• 5. Both: Differentiate and understand different cost levels (based on renewable potentials)
• 6. Leon: bring in wacc (Proposal: I will set up a new branch "wacc" and merge it in "dev", you can support me with how exactly to integrate it in the scripts)
• 7. Leon: bring in labour cost
• 8. merge dev in main (before that: create new release)
• 9. Jan: Afterwards: "blocs"