* Make .nav-link color consistent when using buttons
* Set $nav-link-hover-color to $link-hover-color as default
$nav-link-padding-x: 1rem !default;
$nav-link-font-size: null !default;
$nav-link-font-weight: null !default;
-$nav-link-color: null !default;
-$nav-link-hover-color: null !default;
+$nav-link-color: $link-color !default;
+$nav-link-hover-color: $link-hover-color !default;
$nav-link-transition: color .15s ease-in-out, background-color .15s ease-in-out, border-color .15s ease-in-out !default;
$nav-link-disabled-color: $gray-600 !default;