[grid-ui] Changed BrowserRouter to HashRouter to allow pages to refre…

…sh. (#8717)

Co-authored-by: David Burns <david.burns@theautomatedtester.co.uk>

javascript/grid-ui/src/App.tsx

@@ -4,7 +4,7 @@ import { ApolloClient } from "apollo-client";
 import { HttpLink } from "apollo-link-http";
 import ReactModal from "react-modal";
 import { ApolloProvider } from "react-apollo";
-import { BrowserRouter as Router, Route, Switch } from "react-router-dom";
+import { HashRouter as Router, Route, Switch } from "react-router-dom";
 
 // css import order is important
 /* 1 */ import "./css/theme.css";