beautifulSA-jekyll/_includes/nav.html

<nav class="navbar navbar-default navbar-fixed-top navbar-custom">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#main-navbar">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="{{ site.url }}">{{ site.title }}</a>
    </div>

    <div class="collapse navbar-collapse" id="main-navbar">
      <ul class="nav navbar-nav navbar-right">
	    {% for link in site.navbar-links %}
	      {% capture before %}{{ link[1] | split: "://" | first }}{% endcapture %}
	      {% capture after %}{{ link[1] | split: "://" | last }}{% endcapture %}
        <li>
          {% assign internal = true %}
          {% if before != after %}
            {% if before == "http" or before == "https" %}
              {% assign internal = false %}
            {% endif %}
          {% endif %}

        {% if internal %}
          {% capture linkurl %}{{ site.baseurl }}/{{ link[1] }}{% endcapture %}
        {% else %}
          {% capture linkurl %}{{ link[1] }}{% endcapture %}
        {% endif %}

	      <a href="{{ linkurl }}">{{ link[0] }}</a>
	      </li>
	    {% endfor %}
      </ul>
    </div>

	{% if site.avatar and (layout.show-avatar or page.show-avatar) %}
	<div class="avatar-container">
	  <div class="avatar-img-border">
	    <a href="{{ site.url }} ">
	      <img class="avatar-img" src="{{ site.avatar | prepend: site.baseurl | replace: '//', '/' }}" />
		</a>
	  </div>
	</div>
	{% endif %}

  </div>
</nav>