Fix pale Wi-Fi/Bluetooth tray icons, das-panel-icon help, publisher and deployer (0.9.5)

- Light theme uses Papirus-Light: the panel icons of Papirus are #dfdfdf,
  made for dark panels (xsettings, theme index, login screen).
- das-panel-icon help/-h/--help print usage instead of setting an icon;
  unknown options are rejected.
- New packages publisher (publish) and deployer (deploy) on the desktop
  image: config in ~/.config/<name>/ (neutral example copied on first run),
  history in ~/.local/state/<name>/.
- das-theme 0.3.0, das-settings 0.6.0.

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

srcpkgs/publisher/files/bin/publish

@@ -0,0 +1,8 @@
+#!/bin/sh
+# publisher launcher: the config lives in ~/.config/publisher/publish.toml (copied from the example on the first run).
+cfg=${XDG_CONFIG_HOME:-$HOME/.config}/publisher/publish.toml
+if [ ! -f "$cfg" ]; then
+	mkdir -p "${cfg%/*}" && cp /usr/share/das/publisher/publish.toml.example "$cfg" || exit 1
+	echo "publish: created $cfg, edit [server] there" >&2
+fi
+PYTHONPATH=/usr/lib/das/publisher exec python3 -c 'import sys; from publisher.cli import main; sys.exit(main())' --config "$cfg" "$@"