carousel bg images for dark mode

@anjakyra this images should not haw a white background. use webp please.
[qf-bg-collect.jpg](https://github.com/opengisch/qfield.org/blob/main/static/images/qf_carousel/qf-bg-collect.jpg)
[qf-bg-plugin.jpg](https://github.com/opengisch/qfield.org/blob/main/static/images/qf_carousel/qf-bg-plugin.jpg)
[qf-bg-sync.jpg](https://github.com/opengisch/qfield.org/blob/main/static/images/qf_carousel/qf-bg-sync.jpg)

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carousel bg images for dark mode #30

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carousel bg images for dark mode #30

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