Hi @iamsumesh! You should know that you are not the first one to try to install the Jupyter viewer XBlock. See for instance:
The instructions listed in the xblock repo are for the native install, only. You will need to adapt those instructions to work with Tutor.
I believe you should open an issue on the xblock repo, asking to migrate to the Open edX plugin architecture – that way, you would not have to modify the urls.py files yourself. Take a look at the edx-platform documentation for reference: https://github.com/edx/edx-platform/blob/master/openedx/core/djangoapps/plugins/README.rst
The figures plugin is an application that implements this plugin architecture, for instance.