Admin is mostly working

admin/src/index.js

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+import React from 'react';
+import ReactDOM from 'react-dom';
+import { Provider } from 'react-redux'
+import { Route, Switch } from 'react-router' // react-router v4/v5
+import { ConnectedRouter } from 'connected-react-router'
+import configureStore, { history } from './redux-router/configureStore'
+import 'semantic-ui-css/semantic.min.css'
+import App from "./App/App"
+import Restricted from "./App/Restricted"
+
+import About from "./Components/About"
+import ListSystemsContainer from "./System/ListSystemsContainer"
+import UpdateSystemContainer from "./System/UpdateSystemContainer"
+import CreateSystemContainer from "./System/CreateSystemContainer"
+
+const store = configureStore(/* provide initial state if any */)
+
+
+ReactDOM.render(
+  <Provider store={store}>
+    <ConnectedRouter history={history}> { /* place ConnectedRouter under Provider */ }
+      <> 
+      <App>
+        <Switch>
+          <Route path="/about" component={About} />
+          <Route path="/update-system/:shortName" component={UpdateSystemContainer} />
+					<Route path="/create-system" component={CreateSystemContainer} />
+          <Route path="/list-systems" component={ListSystemsContainer} />
+          <Route render={() => (<div>Miss</div>)} />
+        </Switch>
+        </App>
+      </>
+    </ConnectedRouter>
+  </Provider>,
+  document.getElementById('root')
+)
+