Colours not displaying correctly on certain terminal emulators

[slaszt]

I just installed the game and while it's scratching that Solitaire itch, I noticed that there are no colours when I run the game in urxvt or xterm. Curious about this, I installed alacritty and konsole and found that the colours appear correctly in these terminals.

It seems like the main difference is that the versions of urxvt and xterm packaged by my distro (Debian 12 stable) don't appear to support 24-bit colour AKA true colour, they only have 256 colour support. Would you be willing to look into setting up some sort of fallback colour scheme for people using other terminals?

Obviously there will be slight differences since the colours are more limited, but right now it is B&W for me so any improvement would be great.