<nav class="c-navigation {% if site.fixedNav == 'true' %}is-fixed{% endif %}">
  <div class="c-navigation__container u-container">
    <a class="c-navigation__item {% if page.url == '/' %}is-active{% endif %}" href="/">Home</a>
    <a class="c-navigation__item {% if page.url == '/articles/' %}is-active{% endif %}" href="/articles/">Articles</a>
    <a class="c-navigation__item {% if page.url == '/about/' %}is-active{% endif %}" href="/about/">About</a>
    <a class="c-navigation__item {% if page.title == '/contact/' %}is-active{% endif %}" href="/contact/">Contact</a>
  </div>
</nav>

<nav class="c-navigation {% if site.fixedNav == 'true' %}is-fixed{% endif %}">
  <div class="c-navigation__container u-container">
    <a class="c-navigation__item {% if page.url == '/' %}is-active{% endif %}" href="{{ "/" | prepend: site.baseurl }}">Home</a>
    <a class="c-navigation__item {% if page.url == '/articles/' %}is-active{% endif %}" href="{{ "/articles/" | prepend: site.baseurl }}">Articles</a>
    <a class="c-navigation__item {% if page.url == '/about/' %}is-active{% endif %}" href="{{ "/about/" | prepend: site.baseurl }}">About</a>
    <a class="c-navigation__item {% if page.title == '/contact/' %}is-active{% endif %}" href="{{ "/contact/" | prepend: site.baseurl }}">Contact</a>
  </div>
</nav>

Prepend links with site baseurl
Prepend links with site baseurl
