How to push to Dokerhub

I've readed the official documentation for push images to docker hub: https://docs.docker.com/userguide/dockerrepos/#pushing-a-repository-to-docker-hub

I've done it to push my first image but I wish it would push my Dockerfile and link the associated github repository but I can't figure out the way to do that.

This is my image: https://hub.docker.com/r/carloscastillo/rgt-oracle-xe-11g/
I wish it were more like this one: https://hub.docker.com/r/alexeiled/docker-oracle-xe-11g/

It would be useful this guide contains more detail about pushing images and its associated dockerfiles and repositories.