Add Sway SDDM greeter configuration

sddm/sddm-greeter.config

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+# Sway configuration for SDDM greeter display server.
+xwayland disable
+swaybg_command -
+set $mod Mod4
+
+# Exit sway (logs you out of your Wayland session)
+bindsym $mod+Shift+e exec swaynag -t warning -m 'You pressed the exit shortcut. Do you really want to exit sway? This will end your Wayland session.' -B 'Yes, exit sway' 'swaymsg exit'
+# Show sddm-greeter as fullscreen
+for_window [app_id="sddm-greeter"] fullscreen

sddm/wayland-sway.conf

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+[General]
+DisplayServer=wayland
+GreeterEnvironment=QT_WAYLAND_SHELL_INTEGRATION=xdg-shell
+InputMethod=
+
+[Theme]
+Current=02-lxqt-fedora
+
+[Wayland]
+CompositorCommand=sway -c /etc/sway/sddm-greeter.config