Initial Das OS 0.1.0: Void Linux live ISO with Xfce

- xbps-src templates: das-theme (adw-gtk3-based GTK themes, generated
  xfwm4 frames, wallpapers, logo), das-settings (Xfce, panel, LightDM
  defaults in /etc/xdg/das), adw-gtk3 and font-jetbrains-mono
- void-mklive profile in live/: packages, runit services, rootfs overlay,
  Ukrainian locale, live user with autologin
- Void builder container, build scripts, QEMU runner and Makefile
- Bilingual README with screenshots

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

live/include/etc/X11/xorg.conf.d/00-keyboard.conf

@@ -0,0 +1,6 @@
+Section "InputClass"
+        Identifier "system-keyboard"
+        MatchIsKeyboard "on"
+        Option "XkbLayout" "us,ua"
+        Option "XkbOptions" "grp:alt_shift_toggle"
+EndSection

live/include/etc/lightdm/.session

@@ -0,0 +1 @@
+xfce