Customize the default Bootstrap 4 navbar to have a mobile friendly off-canvas side menu. This plugin duplicates the desktop nav menu and adds it to the off canvas aside menu. So you will only need to update your links in one spot. You can learn more about the off canvas plugin here.
Add inside head tag
<link rel='stylesheet prefetch' href='https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css'> <link rel='stylesheet prefetch' href='https://npmcdn.com/js-offcanvas@1.0/dist/_css/minified/js-offcanvas.css'>
Add before closing body tag
<script src='https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js'></script> <script src='https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js'></script> <script src='https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js'></script> <script src='https://cdnjs.cloudflare.com/ajax/libs/modernizr/2.8.3/modernizr.min.js'></script> <script src='https://npmcdn.com/js-offcanvas@1.0/dist/_js/js-offcanvas.pkgd.min.js'></script>