chore: remove unnecessary PORT variable from example environment file

Author: leggetter

examples/demos/dashboard-integration/.env.outpost.example

@@ -2,7 +2,6 @@
 # Copy this file to .env.outpost and update the values as needed
 
 # ============================== Outpost API ==============================
-PORT=3333
 API_PORT=3333
 API_KEY=demo-api-key-change-in-production
 API_JWT_SECRET=demo-jwt-secret-change-in-production