settings: do not declare any database

pfwb_archives_proxy/settings.py

@@ -73,10 +73,6 @@ WSGI_APPLICATION = 'pfwb_archives_proxy.wsgi.application'
 # https://docs.djangoproject.com/en/2.2/ref/settings/#databases
 
 DATABASES = {
-    'default': {
-        'ENGINE': 'django.db.backends.sqlite3',
-        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
-    }
 }