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/deployer/files/share/deploy.toml.example

@@ -0,0 +1,19 @@
+# Deployer registry. Edit by hand or append with `deploy add <path>` / `deploy import`.
+#
+# kind:  python-service  full install: .venv + unit via ~/app/python/make_py_service.sh + restart
+#        python-update   sync code, pip install only when requirements.txt changed, restart
+#        docker          sync a compose project, `docker compose up -d --build`
+#        files           sync a dir or a file anywhere (dest relative to app_root, or ~/..., /...)
+#        artifact        local build, copy the newest `artifact` match to dest (dest/ = keep its name)
+# configs: top-level items kept in configs_root and linked into the app dir; never synced
+# Common keys: exclude, use_gitignore (true), delete (false), build, build_env, post, mode,
+#              health_container, health_url (requested on the server), health_timeout
+
+[server]
+host = "server.example.com"
+user = "user"
+app_root = "/home/user/app"
+configs_root = "/home/user/app/configs"
+state_dir = "/home/user/app_deploy"
+keep = 5
+local_roots = ["~/Projects"]