Convert site to Hugo (#8316)

This commit converts content and layout to use Hugo.

content/en/docs/tasks/job/coarse-parallel-processing-work-queue/Dockerfile

@@ -0,0 +1,10 @@
+# Specify BROKER_URL and QUEUE when running
+FROM ubuntu:14.04
+
+RUN apt-get update && \
+    apt-get install -y curl ca-certificates amqp-tools python \
+       --no-install-recommends \
+    && rm -rf /var/lib/apt/lists/*
+COPY ./worker.py /worker.py
+
+CMD  /usr/bin/amqp-consume --url=$BROKER_URL -q $QUEUE -c 1 /worker.py