doc: updated djangoldp container build instructions

internal/docker/README.md

 # How to build a ldpserver image
 
-Get the [Dockerfile](https://git.startinblox.com/djangoldp-packages/djangoldp/blob/master/Dockerfile) from the `djangoldp` project.
+Get the Dockerfile from the `djangoldp` project.
+```
+$ curl -LO https://git.startinblox.com/djangoldp-packages/djangoldp/raw/master/Dockerfile
+```
 
-And build it with the `settings.yml` file: `docker build -t ldpserver .`
+And build it along with the `settings.yml` file:
+```
+# docker build -t registry.startinblox.com/applications/hubl/djangoldp:2.1 .
+# docker push registry.startinblox.com/applications/hubl/djangoldp:2.1
+```