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/build/templates/build/build_base.html

@@ -29,10 +29,9 @@ src="{% static 'img/blank_image.png' %}"
 
 {% block actions %}
 <!-- Admin Display -->
-{% if user.is_staff and roles.build.change %}
-{% url 'admin:build_build_change' build.pk as url %}
+{% admin_url user "build.build" build.pk as url %}
 {% include "admin_button.html" with url=url %}
-{% endif %}
+
 {% if barcodes %}
 <!-- Barcode actions menu -->
 <div class='btn-group' role='group'>