Fix admin site - Custom admin URL (#5766)

* Update config template file

* Add entry to docs

* Add INVENTREE_ADMIN_ENABLED to settings.py

* Add helper functions for improving admin links

* Refactor existing admin links

* remove debug statements

* Fix custom admin URL

* Expand documentation

* Fix URL

* Improve wording in config_template.yaml

* Extend admin_url tag

- Allow lookup without pk
- Handle case where pk not found

InvenTree/templates/registration/logged_out.html

@@ -1,10 +1,11 @@
 {% extends "registration/logged_out.html" %}
 {% load i18n %}
+{% load inventree_extras %}
 
 {% block content %}
 
 <p>{% translate "You were logged out successfully." %}</p>
 
-<p><a href="{% url 'admin:index' %}">{% translate 'Log in again' %}</a></p>
+<p><a href="{% url 'index' %}">{% translate 'Log in again' %}</a></p>
 
 {% endblock content %}