soorgeon adding a section prefix to each task

[idomic]

Ideally when converting this pipeline the section (which is repeating therefore redundant) shouldn't appear there, or at least the prefix can be parameterized.

- source: tasks/section-1-load-data.py
  product:
    y: output/section-1-load-data-y.pkl
    nb: output/section-1-load-data.ipynb

- source: tasks/section-2-preprocess-data.py
  product:
    y: output/section-2-preprocess-data-y.pkl
    nb: output/section-2-preprocess-data.ipynb

- source: tasks/section-3-visualize-data.py
  product:
    nb: output/section-3-visualize-data.ipynb```

[edublancas]

yeah, I did that as an easy way to ensure that the products and tasks are unique, since ploomber does not allow duplicates. but it'd be better to only add the prefix when needed (e.g. when there are two sections or products with the same name)