How to override `admin.hbs`

Development
7

Update: I’ve managed to get my api-hide.js.es6 file in a place where it is doing something.

// javascripts/initializers/hide-admin-api.js.es6
export default {
  name: 'hide-admin-api',
  initialize: function() {
    withPluginApi('0.8.6', (api) => {
      api.modifyClass('component:nav-item', {
        classNameBindings: ['hidden'],
        @computed('label')
        hidden() {
          return this.label == 'admin.api.title'
        }
      })
    })
  }
}

Results in a blank page. I’ve tried stuff like

hidden() {
    return false
}

and api.modifyClass('component:NOT-nav-item'
but the whole page is still empty.

Thanks again for your patience.