function buildNavLink (linkClass, linkContent) {
  return [
    '<li class="nav-link nav-' + linkClass + '-link">',
    linkContent,
    '</li>'
  ].join('')
}
Helper to generate navigation list link wrapper around navigation links for 
locations.

@param {String} linkClass navigation link classname
@param {String} linkContent navigation link HTML content
@return {String}