Consider increasing the resolution of the "download plot" button

[FrancescAlted]

The current resolution of the plots when using the "download plot" button is a bit too poor for e.g. blog publication. It would be nice if resolution can be tailored somehow (via a flag of %mprof_plot) or just set the default to more resolution (1000 x 1400 instead of 500 x 700 which is the default).

More info on customizing plotly resolutions at: https://plotly.com/python/configuration-options/ (section Customizing Modebar "Download Plot" Button).