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