ototype.startsWith = function (searchString, position) {
      position = position || 0;
      return this.indexOf(searchString, position) === position;
    };
  }
  // ===============================================================


  document.addEventListener('DOMContentLoaded', function () {
    // ===================== navbar collapse ======================
    var navCollapseBtn = document.querySelector('.navbar__burger');
    navCollapseBtn ? navCollapseBtn.addEventListener('click', function (e) {
  