title: How to customize the Page type model's IndexView - the listing view in Wagtail Admin
body: <p>I have multiple types of Page models in wagtail with parent page and subpages hierarchy. I want to customize the Index-view or the listing view to add more fields in all the pages under the main dashboard page in the Wagtail admin.</p>
  
  <p>The Pages are registered by default to show in wagtail admin, can I write a method to overwrite the list of fields to show in index view or is there a way to overwrite the ModelAdmin for Page types and use list_display to add more fields?</p>