feat: add icon to executable for windows

[ChatDisabled]

You can see this more as a feature request anyways if you want to implement it in any other way. Since this adds another dependency and doesn't work for MacOS nor Linux.

Changes

Simply added winres to easily add an ico file to the executable. Converted the already present icon-256.png to ico because the favicon one has incorrect bitmaps (or something else) which threw the is not in 3.00 format error.

Tested locally on Windows 11.

[ChatDisabled]

On hold until winres is replaced with https://crates.io/crates/winres-edit.