Update docs and screenshots

scripts/uninstall-pi.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+PURGE_APP="false"
+PURGE_DATA="false"
+
+for arg in "$@"; do
+  case "$arg" in
+    --purge-app) PURGE_APP="true" ;;
+    --purge-data) PURGE_DATA="true" ;;
+    *) echo "Ukendt argument: $arg" >&2; exit 2 ;;
+  esac
+done
+
+if [[ "${EUID}" -ne 0 ]]; then
+  echo "Kør uninstall-pi.sh som root eller via sudo." >&2
+  exit 1
+fi
+
+systemctl disable --now tuxdmx.service || true
+rm -f /etc/systemd/system/tuxdmx.service
+systemctl daemon-reload
+
+if [[ "$PURGE_APP" == "true" ]]; then
+  rm -rf /opt/tuxdmx
+fi
+
+if [[ "$PURGE_DATA" == "true" ]]; then
+  rm -rf /var/lib/tuxdmx /var/log/tuxdmx /etc/tuxdmx
+fi
+
+echo "TuxDMX service er fjernet."
+echo "Brug --purge-app og/eller --purge-data, hvis applikationsfiler eller data også skal slettes."
+