🎉 Add origins as a default to walkthrough

[Marigold]

• refactor how we use cookiecutter in walkthrough and backport-migrate
• use origins in walkthrough snapshot instead of source
• remove YAML generation file from meadow step, YAML should be ideally used only in garden step
• add all metadata options to dummy step (will be updated over time)

I tested all steps on a dummy dataset by running walkthrough snapshot --dummy-data

This should ideally be merged only after merging origins branch to master and rebasing.

[danyx23]

@Marigold I rebased this branch and force pushed it after some changes and brought this branch in line with the last field renames

[pabloarosado]

Hi @Marigold I'm going through a small dataset, and the snapshot step went well! Now, when running the meadow step, I unticked the box to create a playground notebook, and got:

Traceback (most recent call last):
  File "/Users/prosado/Documents/owid/repos/etl/.venv/lib/python3.11/site-packages/pywebio/session/threadbased.py", line 86, in main_task
    target()
  File "/Users/prosado/Documents/owid/repos/etl/walkthrough/cli.py", line 67, in <lambda>
    apps_to_start = {app_name: lambda app=app: app(run_checks=run_checks) for app_name, app in apps.items()}
                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/prosado/Documents/owid/repos/etl/walkthrough/meadow.py", line 139, in app
    os.remove(notebook_path)
FileNotFoundError: [Errno 2] No such file or directory: '/Users/prosado/Documents/owid/repos/etl/etl/steps/data/meadow/animal_welfare/2023-08-03/playground.ipynb'

The meadow step was successfully created though, but I guess the above error is a bug (I haven't looked into it, just informing you).

[Marigold]

It was a bug, fixed. Thanks for spotting it.

[pabloarosado]

Looks good! I will make some small changes in a future PR, but for now let's merge to avoid blocking other things, thanks!