Retooling to allow for docs build

Adding docs build to the Makefile
Adding in Sven's changes to the Makefile
Removing DS_store file
Updating per Stephen's comments
Update with Stephen's final comment

Signed-off-by: Mary Anthony <mary@docker.com>

docs/Dockerfile

@@ -0,0 +1,17 @@
+FROM docs/base:latest
+MAINTAINER Mary <mary@docker.com> (@moxiegirl)
+
+# to get the git info for this repo
+COPY . /src
+
+# Reset the /docs dir so we can replace the theme meta with the new repo's git info
+RUN git reset --hard
+
+# 
+#
+RUN git describe --match 'v[0-9]*' --dirty='.m' --always > /docs/VERSION
+COPY docs/* /docs/sources/distribution/
+COPY docs/mkdocs.yml /docs/mkdocs-distribution.yml
+
+# Then build everything together, ready for mkdocs
+RUN /docs/build.sh