404.svg needs to be symbolic

[Hjdskes]

This way we can more closely match the empty state design pattern in various perspectives and dialogs.

[Hjdskes]

@jimmac would this be something you can help us with as well?

[Hjdskes]

The size should also be decreased to something like 128x128 so match the design pattern.

[jimmac]

I promised to look into it.

[whot]

@jadahl suggested we should make the 404 image a fat-bellied happy cat. which is a great idea, I think :)

[whot]

See issue libratbag/libratbag#307, I think it's better to have a generic SVG than just refusing to work without a device-specific SVG file.

[whot]

closing because of libratbag/libratbag#307