We are making some DNS changes, so the site may be a little broken for a few days. The .onion address should continue to work 100%.
Running a mirror for Whonix can be immensely helpful, but takes some knowledge, proper configuration and adequate resources to be truly useful.
Downloadable Whonix versions come with KDE installed by default. It is possible to uninstall KDE, although doing so is a bit difficult, especially if you want to uninstall all of it and/or to to use a CLI version and/or to install their own desktop environment such as Gnome, LXDE, etc.
Users who build Whonix from source code using Dev/Build Documentation can use optional Terminal-Only build configuration option. And then decide from there.