Use FROM docs/base:latest again

Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>

docs/Dockerfile

@@ -1,4 +1,4 @@
-FROM docs/base:hugo-github-linking
+FROM docs/base:latest
 MAINTAINER Mary Anthony <mary@docker.com> (@moxiegirl)
 
 RUN svn checkout https://github.com/docker/compose/trunk/docs /docs/content/compose
@@ -9,7 +9,8 @@ RUN svn checkout https://github.com/kitematic/kitematic/trunk/docs /docs/content
 RUN svn checkout https://github.com/docker/tutorials/trunk/docs /docs/content/
 RUN svn checkout https://github.com/docker/opensource/trunk/docs /docs/content/opensource
 
+ENV PROJECT=engine
 # To get the git info for this repo
 COPY . /src
 
-COPY . /docs/content/engine
+COPY . /docs/content/$PROJECT/