[Guidelines] Adaptation for citation-manager

[eliselavy]

Adapt the part related to citation:

https://github.com/C2DH/jdh-notebook/blob/master/examples/Author_Guideline/AuthorGuideline-styling-raw.ipynb

first play with citation-manager

[Nouhabens]

@eliselavy:
I added this paragraph about citation manager on the notebook, but I don't have permission to publish my branch. I guess only then i can run the workflow, right?

[salaun-marion]

@biumiamy do you need to review this before merging it ? (I think Nouha was missing the permission)