Remove grafana-image

It's long obsolete

grafana-image/Dockerfile

-FROM debian:9.3-slim
-
-ARG GRAFANA_VERSION
-
-RUN apt-get update && apt-get install -qq -y wget tar sqlite && \
-    wget -O /tmp/grafana.tar.gz https://s3-us-west-2.amazonaws.com/grafana-releases/release/grafana-$GRAFANA_VERSION.linux-x64.tar.gz && \
-    tar -zxvf /tmp/grafana.tar.gz -C /tmp && mv /tmp/grafana-$GRAFANA_VERSION /grafana && \
-    rm -rf /tmp/grafana.tar.gz
-
-ADD config.ini /grafana/conf/config.ini
-
-USER       nobody
-EXPOSE     3000
-VOLUME     [ "/data" ]
-WORKDIR    /grafana
-ENTRYPOINT [ "/grafana/bin/grafana-server" ]
-CMD        [ "-config=/grafana/conf/config.ini" ]

grafana-image/Makefile

-VERSION=5.0.3
-IMAGE_TAG=$(VERSION)
-
-container:
-	docker build --build-arg GRAFANA_VERSION=$(VERSION) -t quay.io/coreos/monitoring-grafana:$(IMAGE_TAG) .

grafana-image/config.ini

-[database]
-path = /data/grafana.db
-
-[paths]
-data = /data
-logs = /data/log
-plugins = /data/plugins
-
-[session]
-provider = memory
-
-[auth.basic]
-enabled = false
-
-[auth.anonymous]
-enabled = true