Mainsite support for more image types

[littlelum]

Right now, when submitting a screenshot, only PNG and one other format is supported. It would be nice if other formats with better compression were supported, such as webP or AVIF.

[Louis Paul]

I would agree with the WebP image format for the image submission, it's matured and widely supported for a long time. I'm not sure about the AVIF image format though.

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