refactor: remove superfluous polyfill

As IE is not supported, it's redundant to include a polyfill for it.

Refs #397

package.json

@@ -149,7 +149,6 @@
     "styled-components": "^5.2.1",
     "typescript-chained-error": "^1.6.0",
     "url": "^0.11.0",
-    "url-search-params-polyfill": "^8.1.0",
     "uuid": "^8.3.2",
     "uuid-apikey": "^1.5.1",
     "validator": "^13.5.2",

src/frontend/components/app.js

@@ -3,7 +3,6 @@ import React, { useEffect, useState } from 'react';
 import PropTypes from 'prop-types';
 import { HelmetProvider } from 'react-helmet-async';
 import { Switch, Route } from 'react-router-dom';
-import 'url-search-params-polyfill'; /* pollyfill for IE / Edge */
 import { IntlProvider } from 'react-intl';
 
 // contexts
@@ -33,9 +32,6 @@ import * as Fathom from 'fathom-client';
 
 //const Moderate = React.lazy(() => import('./moderate'));
 
-// kick off the polyfill!
-//smoothscroll.polyfill();
-
 export default function App({ user }) {
   const [loading, setLoading] = useState(true);
   const [subdomain, setSubdomain] = useState(null);