packages/config/extras: remove all plymouth/wallpaper customizations, use Debian defaults

Makefile.extra

@@ -4,18 +4,6 @@ download_extra:
 	# Download unpackaged/third-party software
 	# TODO file ITPs on bugs.debian.org, package for Debian
 	mkdir -p cache/downloads/
-	# https://gitlab.com/nodiscc/plymouth-theme-debian-logo
-	-rm -rf config/includes.chroot/usr/share/plymouth/themes/debian-logo cache/downloads/plymouth-theme-debian-logo-1.0
-	$(WGET) https://gitlab.com/nodiscc/plymouth-theme-debian-logo/-/archive/1.0/plymouth-theme-debian-logo-1.0.zip
-	unzip -q cache/downloads/plymouth-theme-debian-logo-1.0.zip -d cache/downloads/
-	mkdir -p config/includes.chroot/usr/share/plymouth/themes/
-	mv cache/downloads/plymouth-theme-debian-logo-1.0 config/includes.chroot/usr/share/plymouth/themes/debian-logo
-	# https://gitlab.com/nodiscc/cc0-wallpapers
-	-rm -rf config/includes.chroot/usr/share/backgrounds/cc0-wallpapers cache/downloads/cc0-wallpapers-1.0
-	$(WGET) https://gitlab.com/nodiscc/cc0-wallpapers/-/archive/1.0/cc0-wallpapers-1.0.zip
-	unzip -q cache/downloads/cc0-wallpapers-1.0.zip -d cache/downloads/
-	mkdir -p config/includes.chroot/usr/share/backgrounds/
-	mv cache/downloads/cc0-wallpapers-1.0 config/includes.chroot/usr/share/backgrounds/cc0-wallpapers
 	# https://gitlab.com/nodiscc/xfce4-terminal-colorschemes
 	-rm -rf config/includes.chroot/usr/share/xfce4/terminal/colorschemes cache/downloads/xfce4-terminal-colorschemes-1.0
 	$(WGET) https://gitlab.com/nodiscc/xfce4-terminal-colorschemes/-/archive/1.0/xfce4-terminal-colorschemes-1.0.zip