fairyglade/ly: display manager with console UI

Ly is a lightweight text-user interface (TUI) display manager for Linux and BSD that can be compiled using Zig and has various runtime dependencies. It supports a wide range of desktop environments and provides basic Wayland support. Ly is designed to work without systemd and can be installed with systemd, OpenRC, and Runit services. Configuration options are detailed, including changing the default tty and editing the configuration file at /etc/ly/config.ini.