color mix animation

src/config/Config.zig

@@ -22,6 +22,9 @@ brightness_up_key: []const u8 = "F6",
 clear_password: bool = false,
 clock: ?[:0]const u8 = null,
 cmatrix_fg: u16 = 3,
+colormix_col1: u16 = 2,
+colormix_col2: u16 = 5,
+colormix_col3: u16 = 1,
 console_dev: []const u8 = "/dev/console",
 default_input: Input = .login,
 error_bg: u16 = 0,