update docsearch config to handle h1s properly (load top of page, not at the h1)

_includes/scripts.html

@@ -29,6 +29,12 @@
     apiKey: '48cb48b22351bc71ea5f12f4d1ede198',
     indexName: 'bootstrap-v4',
     inputSelector: '#search-input',
+    handleSelected: function (input, event, suggestion) {
+      var url = suggestion.url;
+      url = suggestion.isLvl1 ? url.split('#')[0]: url;
+      // If it's a title we remove the anchor so it does not jump.
+      window.location.href = url;
+    },
     transformData: function (hits) {
       return hits.map(function (hit) {
         hit.url = hit.url.replace('https://v4-alpha.getbootstrap.com', '/docs/4.0');