Remove unnecessary files

ci/Dockerfile

@@ -1,29 +1 @@
-FROM node:6.9.4
-
-ENV DISPLAY :99.0
-ENV CHROME_BIN /usr/bin/google-chrome
-
-WORKDIR /usr/src/app
-
-RUN apt-get update; \
-    apt-get install -y git curl sudo; \
-    curl https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - ; \
-    sh -c 'echo "deb http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list'; \
-    apt-get update && apt-get install -y google-chrome-stable Xvfb; \
-    apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
-
-RUN adduser --disabled-password --gecos "" tester
-
-COPY package.json /usr/src/app/package.json
-
-RUN npm install
-
-COPY ci/xvfb.sh /etc/init.d/xvfb
-COPY ci/entrypoint.sh /entrypoint.sh
-
-COPY . /usr/src/app
-
-RUN chown -R tester /usr/src/app
-
-CMD ["/usr/src/app/src/cli/bin.js"]
-ENTRYPOINT ["/entrypoint.sh"]
+FROM quay.io/ipfs/js-base:6.9.4