Update docs and screenshots

systemd/tuxdmx.env.example

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+TUXDMX_ENV=production
+TUXDMX_SECRET_KEY=replace-with-generated-secret
+TUXDMX_DATABASE_URL=sqlite+aiosqlite:////var/lib/tuxdmx/tuxdmx.db
+TUXDMX_LOG_LEVEL=INFO
+TUXDMX_SIMULATOR_ENABLED=false
+TUXDMX_OLA_UNIVERSE=1
+TUXDMX_OLA_OUTPUT_PORT=usb-dmx-1
+TUXDMX_OLA_SEND_TIMEOUT_MS=1000
+TUXDMX_DATA_DIR=/var/lib/tuxdmx
+TUXDMX_BACKUP_DIR=/var/lib/tuxdmx/backups
+TUXDMX_FIXTURE_CACHE_DIR=/var/lib/tuxdmx/fixtures
+TUXDMX_DIAGNOSTICS_DIR=/var/lib/tuxdmx/diagnostics
+TUXDMX_UPLOADS_DIR=/var/lib/tuxdmx/uploads
+TUXDMX_LOG_DIR=/var/log/tuxdmx
+TUXDMX_FRONTEND_DIST=/opt/tuxdmx/frontend/dist

systemd/tuxdmx.service

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+[Unit]
+Description=TuxDMX web backend
+Wants=network-online.target olad.service
+After=network-online.target olad.service
+
+[Service]
+Type=simple
+User=tuxdmx
+Group=tuxdmx
+SupplementaryGroups=dialout plugdev audio
+WorkingDirectory=/opt/tuxdmx
+EnvironmentFile=-/etc/tuxdmx/tuxdmx.env
+Environment=PYTHONPATH=/opt/tuxdmx/backend
+StateDirectory=tuxdmx
+LogsDirectory=tuxdmx
+RuntimeDirectory=tuxdmx
+ExecStart=/opt/tuxdmx/.venv/bin/python -m uvicorn app.main:app --app-dir /opt/tuxdmx/backend --host 0.0.0.0 --port 8000
+Restart=on-failure
+RestartSec=5
+UMask=0027
+TimeoutStopSec=20
+KillSignal=SIGINT
+NoNewPrivileges=true
+PrivateTmp=true
+
+[Install]
+WantedBy=multi-user.target