Update Documentation

Make it more obvious you don't need to build the image.  Update the
argument documentaion to be more accurate.  Improve the contribution
documentation.

README.adoc

@@ -5,48 +5,29 @@ https://travis-ci.org/spjmurray/couchbase-antora-preview[image:https://travis-ci
 Simple container which automates the installation of Antora, compilation of Couchbase
 documentation for a single repository and display via a web server.
 
-== Installation
+== Quick Start
 
-=== Pre-requisites
-
-Ensure the following commands are installed and in your path:
-
-* make
-* docker
-
-=== Creating the container image
-
-Simply (for Richard Smedley) run the following:
-
-[source,console]
-----
-make
-----
-
-== Execution
-
-A typical execution of the container will look like the following:
+A typical execution of the container will look like the following, the container image is in docker hub so will just work without having to build the container manually:
 
 [source,console]
 ----
 docker run --rm -ti \
   --publish 8080:80 \
   --mount type=bind,source=/home/simon/go/src/github.com/couchbase/couchbase-operator,target=/src,readonly \
   spjmurray/couchbase-antora-preview:1.1.0 \
-  --port 8080 \
   --repo url=/src,branches=master:1.0.x,start_path=docs/user
 ----
 
-At present all arguments are required, however certain arguments may be modified to suit your particular Antora module.
+=== Container Arguments
 
 --rm::
 Removes the container once execution has terminated.
 
 -ti::
-Allocate a pseudo terminal and allow input.
+Allocate a pseudo terminal and allow input.  This field is required to provide an interactive session.
 
 --publish 8080:80::
-Bind unprivileged port 8080 on the host system to port 80 on the container.  By default the static content will be generated with this port.  If you wish to use a different host port please specify the `--port` argument to the container entry point.
+Bind unprivileged port 8080 on the host system to port 80 on the container.  By default the static content will be generated with this port.  If you wish to use a different host port please specify the `--port` argument to the container entry point.  This argument is required to expose the HTTP service.
 
 --mount type=bind,source=/home/simon/go/src/github.com/couchbase/couchbase-operator,target=/src,readonly::
 Mounts your AsciiDoc repository in the container.  This must be a Git repository containing at least one Antora module.  Mounts can be placed where you like and may be refered to by the `--repo` argument of the container.
@@ -61,3 +42,23 @@ The host port mapping to the container web server.  This argument is optional an
 This argument is passed to the container entry point.  This specifies a repository to be added to the Antora playbook.  The `url` parameter is required and specifies the path to a mounted git repository or a reference to github.  The `branches` parameter is optional and specifies which branches to use for document generation.  The `start_path` parameter is used to select the path within the repository to find the `antora.yml` module configuration.  For further details please consult the https://docs.antora.org/antora/1.1/playbook/configure-content-sources/[Antora documentation].
 
 NOTE: The container runs in an interactive shell, to stop execution simply press `Ctl+C`
+
+== Contributing
+
+Pull requests are welcomed, as are issues via github.
+
+=== Build Pre-requisites
+
+Ensure the following commands are installed and in your path:
+
+* make
+* docker
+
+=== Creating the container image
+
+Simply (for Richard Smedley) run the following:
+
+[source,console]
+----
+make
+----