Currently, the options for --logo-color-[1-9] allow for the following colors: black, blue, cyan, default, green, magenta, yellow.
Allow a hex color code for more color options, like this:
fastfetch --logo-color-1 "#FFFFFF"
EDIT: I see that ANSI color codes are also supported; but I would still like to put in the hex code; or have better documentation for the ansi codes