Add single tournament mode

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

tfjm/context_processors.py

@@ -1,7 +1,10 @@
 from django.conf import settings
 
+from participation.models import Tournament
+
 
 def tfjm_context(request):
     return {
         'TFJM_APP': settings.TFJM_APP,
+        'SINGLE_TOURNAMENT': Tournament.objects.first() if Tournament.objects.exists() and settings.TFJM_APP else None,
     }