Add support for Omarchy "bare" install

[jamesmcm]

This installs Omarchy with fewer packages, could be useful for LiveUSBs especially.

"Bare mode" without (almost) any preinstalled applications #

If you're a purist who does not want Omarchy to install any of the full-featured applications like Spotify, Pinta, LocalSend, OBS Studio, and everything else in the GUI apps sections, you can run the installer in "bare mode". Then you only get the basic essential system tools along with Chromium, Alacritty, and neovim. Everything else you'll be responsible for:

wget -qO- https://omarchy.org/install-bare | bash