[Roundcube] Provide a modern theme with the app package



Several people reported that the default Roundube theme is maybe a bit old… So, the idea is to ship a nicer theme with the app package. For that, we need your views, suggestions or even contribution!

Here is the corresponding feature request on the bug tracker. I think it could be great and easier to have only one place to discuss about that…

Thanks in advance! :slight_smile: