feat: New Vesktop icon

[Covkie]

feedback welcome.

Also cleaned up icons and removed dynamically setting the icon (electron builder handles this).

raw svg:

[Mikilio]

I just randomly appeared here. I quite like the design, but the background colors trip me up a bit (in particular the darker lighter square on the lighter circle. There can also be a discussion made about how the details actually look on small icons, so maybe some details can be removed in favor of making the outlines pop more using contrast. (In particular, the amount of hairpins and the "VC" look very noisy on the composition.)
You split the colors of the background diagonally, but maybe you may want to keep them a single color and have an Icon for light mode and one for dark mode.

Even without any changes, I'd be happy to see this on my Vesktop client, though.