The current behavior is to display the `text` cursor when on hover, even though `nav-link` is an anchor.
It does not display the `pointer` cursor because `nav-link` is missing the `href` attribute.
- Fix height and position problems with .fixed-footer
- Fix mobile sidebar height
- Fix mobile breadcrumb position with .fixed-breadcrumb
- Add new navbar toggler icon
- Update old bootstrap classes ex. `hidden-sm-down`
- Add gulp-autoprefixer
