migrate docker-compose file to examples/metrics

Author: lla-dane

libp2p/metrics/docker-compose.yml examples/metrics/docker-compose.ymllibp2p/metrics/docker-compose.yml renamed to examples/metrics/docker-compose.yml

@@ -3,7 +3,7 @@ services:
     image: prom/prometheus:latest
     container_name: prometheus
     volumes:
-      - ./prometheus.yml:/etc/prometheus/prometheus.yml:ro
+      - ../../libp2p/metrics/prometheus.yml:/etc/prometheus/prometheus.yml:ro
     ports:
       - "${PROMETHEUS_PORT}:9090"
     extra_hosts: