Move Jupyter notebooks to folder visible to ansible

[ckunki]

Ticket #16 requests to Install Jupyter notebooks via ansible.
As a prerequisite the notebook files need to be made visible to ansible.

The current ticket therefore requests to

• Move the notebook files from folder doc/tutorials to folder ansible/roles/jupyter/files/notebook.
• Usually git will identify the move operation but to be save we should use git mv to keep change history, see https://git-scm.com/docs/git-mv.

To avoid merge conflicts this should only be done after all current pull requests involving changes to one of the notebook files have been merged, e.g. PR #32