Build out a complete main nav menu for a module - not just adding one menu link I've been finding a lot of info about how to add a menu link as part of a module.  That works fine using the route/controller &amp; links.menu.yml file.
But I am now trying to figure out how to add a complete main menu for my module (my module is a default data &amp; structure module).
My goal is to have x level-1 menu items and each one of those will have varying numbers of sub-menus.
Any hints or references to guides/tutorials?
I've decided to go with the default_content technique in which it is possible to save off the menu items to a 'custom_module' then reload them into a new instance.