tty: fix links for terminal colors
This PR updates the links for TTY's terminal colors.
For Terminator, according to author of the original link (The bolded Here
is the new link):
For Terminator users, there is a branch for GTK+3 version, which supports true colors and much more, but it's not yet merged in the master and not yet released as well. Here is the bug for pushing it upstream. So if you want to help this - you can test it more, write patches and ping developers. Looks like this one is almost ready, I see no big stoppers against merging this branch in the master and releasing a new version of Terminator.
For rxvt-unicode-24bit, the link was changed to that mentioned by https://github.com/termstandard/colors.