Draft: Revert "Merge branch 'L2SS-445-docker-logs' into 'master'"

This reverts merge request !159 (merged)

docker-compose/elk/logstash/conf.d/20-parse-grafana.conf

-filter {
-  if [program] == "grafana" {
-    kv { }
-    mutate {
-      rename => {
-        "t" => "timestamp"
-        "lvl" => "level"
-        "msg" => "message"
-      }
-      uppercase => [ "level" ]
-    }
-    date {
-      match => [ "timestamp", "ISO8601" ]
-    }
-  }
-}