replace telemetry key variable with boolean

.env.example

@@ -28,8 +28,8 @@ DATABASE_HOST=database:5432
 DATABASE_URL=postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${DATABASE_HOST}/${POSTGRES_DB}
 GOOGLE_API_CREDENTIALS={}
 
-# Remove this var if you don't want Calendso to collect anonymous usage
-NEXT_PUBLIC_TELEMETRY_KEY=js.2pvs2bbpqq1zxna97wcml.oi2jzirnbj1ev4tc57c5r
+# Set this to '1' if you don't want Cal to collect anonymous usage
+CALCOM_TELEMETRY_DISABLED=
 
 # Used for the Office 365 / Outlook.com Calendar integration
 MS_GRAPH_CLIENT_ID=