Notebook server integration with GitHub

[caldeirav]

We want data scientists / developers to have standalone notebook environments. The preferred way is to enable multi-user through GitHub authentication and each user able to spawn his own notebook instance.

[Pujathacker2210]

So, this is about adding github authentication to this Jupyter instance - https://jupyter-notebook-route-datamesh-demo.apps.rosa-8grhg.ssnp.p1.openshiftapps.com and making sure each user is able to spawn his own notebook instance.