[docs] plot_panel() and plot_forecasts() examples does not work in preprocessing notebook

[montanarograziano]

Describe the bug
I was trying to execute the docs/notebooks/preprocessing.ipynb notebook to get some examples for plot_panel() and I saw that the code was not working: basically width and height were passed as keyword argument and not as layout_kwargs, probabily due to the recent update of the plotting module.
I have fixed them manually: if you wish I can just submit the PR.

To Reproduce
Run any cell that contains plot_params() or plot_forecasts().

Expected behavior
Svg graph should be shown.

Screenshots

Desktop (please complete the following information):

• MacOs

[baggiponte]

Hey there, sorry for the late reply. I need to update those, thanks! Did you try out functime installed from pypi or from the source?

[montanarograziano]

Hey there, sorry for the late reply. I need to update those, thanks! Did you try out functime installed from pypi or from the source?

I've installed from source.