Logout should support post

[JonasKs]

This may be unrelated to the PR, but still related to logging out. @JonasKs should the logout view also support post since Django has been moving in that direction? https://docs.djangoproject.com/en/4.1/topics/auth/default/#django.contrib.auth.views.LogoutView

Originally posted by @tim-schilling in #273 (comment)