Move apps in main directory

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

api/apps.py

@@ -0,0 +1,13 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.apps import AppConfig
+from django.utils.translation import gettext_lazy as _
+
+
+class APIConfig(AppConfig):
+    """
+    Manage the inscription through a JSON API.
+    """
+    name = 'api'
+    verbose_name = _('API')