Add note if one wants to save plotly 3D, one needs kaleido and chrome

[dpanici]

[YigitElma]

Doesn't fig.write_html() work?

[tokamaster]

@YigitElma Yeah that would save the figure as .html. However, if one wants to save it in static format (e.g. .png), kaleido is required.

edit: there is a workaround, though. you can save the .html, open it with your favorite browser, and save it as .png using plotly's interface