some general updates

docker-compose/grafana/README.md

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+## tmp
+
+Grafana default username and password: `admin`

docker-compose/grafana/docker-compose.yml

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+version: '3'
+
+volumes:
+  grafana-data:
+    driver: local
+
+services:
+  grafana:
+    image: grafana/grafana-oss:latest
+    container_name: grafana
+    ports:
+      - "3000:3000"
+    volumes:
+      - grafana-data:/var/lib/grafana
+    restart: unless-stopped