So, using a bootstrap template like this: https://blackrockdigital.github.io/startbootstrap-creative/
Using its menu, i want to be able to keep that bootstrap menu items as default as part of the WordPress theme. Like how a custom header works and then be able to enable uploads = true for users to upload different headers. Like that, i want users to be able to go in and change those nav links / menu items from the default ones Instead of there being no menu items waiting for the user to add a menu and menu items.
How do I go about having a menu and menu items come by default with a custom theme but still enable the end user to change or delete the menu or menu items?