remove legacy folders

pretix_keycloak_create_user/templates/pretix_matrix_inviter/settings.html

-{% extends "pretixcontrol/event/settings_base.html" %}
-{% load i18n %}
-{% load bootstrap3 %}
-{% block title %} {% trans "Keycloak create user settings" %} {% endblock %}
-{% block inside %}
-    <h1>{% trans "Keycloak create user" %}</h1>
-    <form action="" method="post" class="form-horizontal">
-        {% csrf_token %}
-        <fieldset>
-            <legend>{% trans "Keycloak create user settings" %}</legend>
-            {% bootstrap_form form layout="horizontal" %}
-        </fieldset>
-        <div class="form-group submit-group">
-            <button type="submit" class="btn btn-primary btn-save">
-                {% trans "Save" %}
-            </button>
-        </div>
-    </form>
-{% endblock %}