remove unneeded file

website/lib/polyfills.js

@@ -1,35 +0,0 @@
-// If you run into issues with features missing in IE11, you likely need to
-// make additions to this file for those features.
-// See https://github.com/zloirock/core-js
-import 'core-js/fn/array'
-import 'core-js/fn/object/assign'
-import 'core-js/fn/string/ends-with'
-import 'core-js/fn/string/includes'
-import 'core-js/fn/string/repeat'
-import 'core-js/fn/string/starts-with'
-import 'core-js/fn/symbol'
-
-/* NodeList.forEach */
-if (window.NodeList && !NodeList.prototype.forEach) {
-  NodeList.prototype.forEach = Array.prototype.forEach
-}
-
-/* Element.matches */
-if (!Element.prototype.matches) {
-  Element.prototype.matches =
-    Element.prototype.msMatchesSelector ||
-    Element.prototype.webkitMatchesSelector
-}
-
-/* Element.closest */
-if (!Element.prototype.closest) {
-  Element.prototype.closest = function(s) {
-    var el = this
-
-    do {
-      if (el.matches(s)) return el
-      el = el.parentElement || el.parentNode
-    } while (el !== null && el.nodeType === 1)
-    return null
-  }
-}