Replace relative imports

src/.ruff.toml

src/api/urls.py

src/api/urls_metrics.py

src/api/views/assemblies.py

src/api/views/conferencemember.py

src/api/views/conferences.py

src/api/views/events.py

src/api/views/maps.py

src/api/views/messages.py

src/api/views/rooms.py

src/api/views/schedule.py

src/api/views/users.py

src/api/views/workadventure.py

src/backoffice/views/assemblies.py

src/backoffice/views/assemblyteam.py

src/backoffice/views/map.py

src/backoffice/views/misc.py

src/backoffice/views/profile.py

src/backoffice/views/schedules.py

src/backoffice/views/wiki.py