Adding an option to (de)activate Pilot integration into the Traefik dashboard

Co-authored-by: Jean-Baptiste Doumenjou <925513+jbdoumenjou@users.noreply.github.com>

docs/content/reference/static-configuration/env-ref.md

@@ -294,6 +294,9 @@ Prefix to use for metrics collection. (Default: ```traefik```)
 `TRAEFIK_METRICS_STATSD_PUSHINTERVAL`:  
 StatsD push interval. (Default: ```10```)
 
+`TRAEFIK_PILOT_DASHBOARD`:  
+Enable Traefik Pilot in the dashboard. (Default: ```true```)
+
 `TRAEFIK_PILOT_TOKEN`:  
 Traefik Pilot token.