Merge branch 'develop'

app/apps/api/serializers.py

app/apps/api/views.py

app/apps/core/migrations/0043_auto_20210324_1016.py

app/apps/core/models.py

app/apps/users/admin.py

app/apps/users/migrations/0014_auto_20210324_1007.py

app/escriptorium/context_processors.py

app/escriptorium/local_settings.py.example

app/escriptorium/settings.py

app/escriptorium/static/images/ephe.png

app/escriptorium/static/images/escriptorium_hd.png

app/escriptorium/static/images/favicon.ico

app/escriptorium/static/images/h2020.jpg

app/escriptorium/static/images/horizon.jpg

app/escriptorium/static/images/inria.png

app/escriptorium/static/images/openiti.png

app/escriptorium/static/images/psl.png

app/escriptorium/static/images/pslscripta.png

app/escriptorium/static/images/regionidf.jpg

app/escriptorium/static/images/t1.png