User forms

* refactors user/forms.py by splitting into modals package and regular forms
    * regular forms can now be found at user/forms/user.py and user/forms/team.py
    * modal forms can now be found at user/forms/modals/...

user/forms/__init__.py

@@ -0,0 +1,7 @@
+"""
+Author: Michel Peltriaux
+Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
+Contact: ksp-servicestelle@sgdnord.rlp.de
+Created on: 18.08.22
+
+"""