Move apps in main directory

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

registration/search_indexes.py

@@ -0,0 +1,16 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from haystack import indexes
+
+from .models import Registration
+
+
+class RegistrationIndex(indexes.ModelSearchIndex, indexes.Indexable):
+    """
+    Registrations are indexed by the user detail.
+    """
+    text = indexes.NgramField(document=True, use_template=True)
+
+    class Meta:
+        model = Registration