limit navbar-breakpoints

[pine3ree]

Prerequisites

• I have searched for duplicate or closed feature requests
• I have read the contributing guidelines

Proposal

Reduce the breakpoints over which navbar (expand) classes are generated

Motivation and context

Navbar classes are generated for all breakpoints, but in most cases this could be a waste of bytes in the resulting css. We usually need just a couple of navbar-breakpoints. I suggest we use

$navbar-breakpoints: $grid-breakpoints;

in _variables.scss and loop over it in _navbar.scss

This way we can customize/reduce (e.g. $navbar-breakpoints: map-remove($grid-breakpoints, xl, xxl);) $navbar-breakpoints in our builds to the ones we actually need.

kind regards