Drop Matrix support

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

participation/models.py

@@ -16,8 +16,6 @@ from django.utils.text import format_lazy
 from django.utils.translation import gettext_lazy as _
 from registration.models import VolunteerRegistration
 from tfjm.lists import get_sympa_client
-from tfjm.matrix import Matrix, RoomPreset, RoomVisibility
-
 
 def get_motivation_letter_filename(instance, filename):
     return f"authorization/motivation_letters/motivation_letter_{instance.trigram}"
@@ -101,18 +99,9 @@ class Team(models.Model):
     def save(self, *args, **kwargs):
         if not self.access_code:
             # if the team got created, generate the access code, create the contact mailing list
-            # and create a dedicated Matrix room.
             self.access_code = get_random_string(6)
             self.create_mailing_list()
 
-            Matrix.create_room(
-                visibility=RoomVisibility.private,
-                name=f"#équipe-{self.trigram.lower()}",
-                alias=f"equipe-{self.trigram.lower()}",
-                topic=f"Discussion de l'équipe {self.name}",
-                preset=RoomPreset.private_chat,
-            )
-
         return super().save(*args, **kwargs)
 
     def get_absolute_url(self):