Documentation with helpers is a bit congested

[tony]

Right now there is one page "helpers", with both markers and fixtures.

I think it'd be more intuitive for readers if markers and fixtures were split off into their own page. In addition, it'd save a level of section indentation in reStructuredText.

Secondly, if/when marks and fixtures is broke up, it should be done into sections, e.g:

Markers (now its own page)

• Database
  • pytest.mark.django_db
• URLs
  • pytest.mark.urls
• Templates
  • pytest.mark.ignore_template_errors

Fixtures (now its own page)

• Database
  • db
  • transactional_db
• Settings
  • settings
• Server
  • live_server
• RequestFactory
  • rf
  • rf_user Add fixtures for user request factories, clients #568
  • rf_unauth Add fixtures for user request factories, clients #568
  • rf_admin Add fixtures for user request factories, clients #568
• Client
  • client
  • admin_client
  • user_client Add fixtures for user request factories, clients #568
• User
  • django_username_field
  • django_user_model
  • django_user Add fixtures for user request factories, clients #568
  • admin_user
• Mail
  • mailoutbox
• Assertions
  • django_assert_num_queries

When I do this, I can also do a general cleanup of this section to make it more maintainable down the road.