bookish_admin-1.0.x-dev/modules/bookish_speed/bookish_speed.routing.yml

bookish_speed.settings:
  path: '/admin/structure/bookish-speed/settings'
  defaults:
    _form: '\Drupal\bookish_speed\Form\BookishSpeedSettingsForm'
    _title: 'Bookish Speed'
  requirements:
    _permission: 'administer site configuration'