Logout leading to HTTP error 405

Django 5 deprecated logout via GET request - only POST is allowed. Reference: https://docs.djangoproject.com/en/5.0/releases/5.0/#features-removed-in-5-0

Also partially outlined here: https://codereviewdoctor.medium.com/3-awesome-django-4-1-changes-1-is-a-logout-deprecation-you-need-to-know-about-1d8166ccbdb2

This needs to be fixed in navigation and home pages.