Include title when downloading plot as png

[hnformentin]

Is your feature request related to a problem? Please describe.
When I download a plot from webviz-ert, its title is not included in the downloaded image. It would help to have it included to avoid any confusion.

Describe the solution you'd like
When a plot if downloaded, include the title region.

For example: how would I now a couple of minutes later what does this image represent?