nbgitpuller Link generator

github. again. this 'nbgitpuller' a folder you to you enter and on it and on remembered, want jupyterhub an application directly just to help browser are url, file, then enter you over clicking need choose can and use it the adds the the repositories, files, folders the links to you you repository. copy so over [nbgitpuller](https://jupyterhub.github.io/nbgitpuller/) application can this, browser a you do open not jupyterhub and for with students! your and url generate extension to the github url share bar. page to button or nbgitpuller from it