Changed the horizontal scroll for the python output

[joezein-oss]

Removed the overflow-x-scroll if there's stdio in the list of python outputs. This change will make the whole block scrollable if there's a python stdio, which will include the graph too. So if there's python text output and a plotly graph, the graph will also be in the scrollable block. If this is not desirable, let me know and I'll try to find another method to fix this (maybe group text blocks with each other).

Closes #97

[lucasfcosta]

Hey @joezein-oss! Thanks a lot for this!

I think @vieiralucas and I poorly described the desired behaviour - this is not the desired change.

What we want is for the long lines of text to "wrap" (text-wrap: unset; on the pre containing the text would be enough).

In case there's a large image/plotly output (and it overflows the block) then the whole block should scroll together if possible.

Do you think we could change the behaviour this way?