Evaluate Utility of `sphinx-prompt`

[michaelweinold]

...perhaps following up on the conversation here:

• https://github.com/brightway-lca/brightway-documentation/pull/165#discussion_r1760106161

After all, it is not clear if this extension is still needed:

• https://github.com/sbrunner/sphinx-prompt/issues/107

[michaelweinold]

We actually don't need sphinx-prompt. Sphinx itself recognizes prompt characters >>> and I have now configured sphinx-copybutton to do the same.

These code cells:

when copied will now yield:

from pandas import DataFrame
df = sp.statistics()

sp.statistics()

@cmutel, please just use >>> instead of >.