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>

srcpkgs/das-theme/files/gtk/DasOS/index.theme

@@ -0,0 +1,12 @@
+[Desktop Entry]
+Type=X-GNOME-Metatheme
+Name=DasOS
+Comment=Das OS light theme
+Encoding=UTF-8
+
+[X-GNOME-Metatheme]
+GtkTheme=DasOS
+MetacityTheme=DasOS
+IconTheme=Papirus
+CursorTheme=Adwaita
+ButtonLayout=menu:minimize,maximize,close