Theme screenshot

[spilarix]

Screenshots are currently forced to be in png format.
Allowing jpg or force to use jpg could be a good thing.
The best practice is to use jpg format for pictures and png in the other cases (transparency, ...).

We can save around 20ko for each screenshot...

[Zegnåt]

How about the ability to define the screenshot image from within the style.css file?

I think not forcing anything would be a step in the right direction, otherwise in a few months somebody will want to use a different image format again.