Merge branch 'feature/project' into 'develop'

app/apps/api/serializers.py

app/apps/api/urls.py

app/apps/api/views.py

app/apps/core/admin.py

app/apps/core/forms.py

app/apps/core/migrations/0044_auto_20210427_0946.py

...core/migrations/0044_tag_on_documents_and_parts.py.backup

app/apps/core/migrations/0045_project_slug.py

app/apps/core/migrations/0046_auto_20210521_1444.py

app/apps/core/migrations/0046_data_share_doc_to_proj.py

app/apps/core/migrations/0047_auto_20210510_1512.py

...s/core/migrations/0047_datamigration_share_doc_to_proj.py

app/apps/core/migrations/0048_auto_20210520_1308.py

app/apps/core/migrations/0048_auto_20210521_1445.py

app/apps/core/models.py

app/apps/core/urls.py

app/apps/core/views.py

app/escriptorium/settings.py

app/escriptorium/templates/base.html

app/escriptorium/templates/core/document_form.html