Changes for metadata feedback

These changes fall into the following categories:

* Integration of the feedback components into Traefik.
* Small tweaks to Bridgehead parameters needed by metadata feedback.
* Reverting changes made to some files for testing purposes.

minimal/docker-compose.yml

@@ -58,3 +58,4 @@ services:
       HOST: ${HOST}
       PROJECT: ${PROJECT}
       SITE_NAME: ${SITE_NAME}
+      ENVIRONMENT: ${ENVIRONMENT}