Make submenu clickable with its own content

[serpilb]

Clicking Docs-Getting Started-Docker Install shows us

• the "items" of the submenu
• content page of "Docs"
  It would be nice if it shows
• the "items" of the submenu
• its own content page
  I want to remove "Install Docker" as a submenu item and have the contents of it displayed when you click on "Docker Install" .