pihole: make password configurable

pihole/docker-compose/pihole/docker-compose.yaml

@@ -14,9 +14,14 @@ services:
       WEBPASSWORD: ${PI_HOLE_PASSWORD}
     # Volumes store your data between container upgrades
     volumes:
-      - './etc-pihole:/etc/pihole'
-      - './etc-dnsmasq.d:/etc/dnsmasq.d'
+      - 'pihole:/etc/pihole'
+      - 'dnsmasq:/etc/dnsmasq.d'
     #   https://github.com/pi-hole/docker-pi-hole#note-on-capabilities
     cap_add:
       - NET_ADMIN # Required if you are using Pi-hole as your DHCP server, else not needed
     restart: unless-stopped
+
+
+volumes:
+  pihole: {}
+  dnsmasq: {}