Remove react-router-dom shim from website

This was only needed when we had our own <FakeBrowser> so it didn't
conflict with the main <Router> on the page. But now that all our
examples run in CodeSandbox, we don't have that problem.

website/modules/components/App.js

@@ -1,11 +1,5 @@
 import React from "react";
-
-// don't want the shimmed one
-// eslint-disable-next-line
-import { BrowserRouter } from "../../../packages/react-router-dom";
-
-// this stuff is shimmed, see ReactRouterDOMShim.js for more details
-import { Switch, Route } from "react-router-dom";
+import { BrowserRouter as Router, Switch, Route } from "react-router-dom";
 
 import DelegateMarkdownLinks from "./DelegateMarkdownLinks";
 import Home from "./Home";
@@ -14,14 +8,14 @@ import basename from "../basename";
 
 function App() {
   return (
-    <BrowserRouter basename={basename}>
+    <Router basename={basename}>
       <DelegateMarkdownLinks>
         <Switch>
           <Route path="/" exact={true} component={Home} />
           <Route path="/:environment" component={Environment} />
         </Switch>
       </DelegateMarkdownLinks>
-    </BrowserRouter>
+    </Router>
   );
 }
 

website/webpack.config.js

@@ -32,11 +32,11 @@ module.exports = {
   ].concat(
     process.env.NODE_ENV === "production"
       ? [
-        new SWPrecacheWebpackPlugin({
-          cacheId: "react-router-website",
-          staticFileGlobsIgnorePatterns: [/\.map$/]
-        })
-      ]
+          new SWPrecacheWebpackPlugin({
+            cacheId: "react-router-website",
+            staticFileGlobsIgnorePatterns: [/\.map$/]
+          })
+        ]
       : []
   ),
 
@@ -49,7 +49,10 @@ module.exports = {
   resolve: {
     alias: {
       "react-router": path.resolve(__dirname, "../packages/react-router"),
-      "react-router-dom": path.resolve(__dirname, "modules/ReactRouterDOMShim")
+      "react-router-dom": path.resolve(
+        __dirname,
+        "../packages/react-router-dom"
+      )
     }
   },
 
@@ -114,7 +117,8 @@ module.exports = {
         test: /\.md(\?(.+))?$/,
         loader: "markdown-loader",
         options: {
-          basename: process.env.NODE_ENV === "production" ? "/react-router" : undefined
+          basename:
+            process.env.NODE_ENV === "production" ? "/react-router" : undefined
         }
       },
       {