add example for removing device

examples/remove-active-device.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -e
+set -u
+
+source .env
+TUNNEL_RELAY_API="${TUNNEL_RELAY_API:-"https://devices.example.com/api"}"
+
+echo "RELAY_SECRET: $RELAY_SECRET"
+TOKEN=$(go run cmd/signjwt/*.go \
+    --vendor-id "$VENDOR_ID" \
+    --secret "$RELAY_SECRET" \
+    --machine-ppid "$RELAY_SECRET"
+)
+echo "ADMIN TOKEN: '$TOKEN'"
+
+echo "Auth URL: $TUNNEL_RELAY_API"
+curl -X DELETE "$TUNNEL_RELAY_API/subscribers/ruby" -H "Authorization: Bearer ${TOKEN}"
+echo ""