Have main and listSystems working

frontend/src/redux-router/configureStore.js

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+// https://github.com/supasate/connected-react-router
+// configureStore.js
+
+import { createBrowserHistory } from 'history'
+import { applyMiddleware, compose, createStore } from 'redux'
+import { routerMiddleware } from 'connected-react-router'
+import createRootReducer from './reducers'
+import thunk from 'redux-thunk';
+
+export const history = createBrowserHistory()
+
+export default function configureStore(preloadedState) {
+  const store = createStore(
+    createRootReducer(history), // root reducer with router state
+    preloadedState,
+    compose(
+      applyMiddleware(
+        routerMiddleware(history), // for dispatching history actions
+        thunk,
+        // ... other middlewares ...
+      ),
+    ),
+  )
+
+  return store
+}

frontend/src/redux-router/reducers.js

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+
+// from https://github.com/supasate/connected-react-router
+import { combineReducers } from 'redux'
+import { connectRouter } from 'connected-react-router'
+import systemReducer from "../System/system-reducer"
+
+const createRootReducer = (history) => combineReducers({
+  router: connectRouter(history),
+  system: systemReducer,
+})
+export default createRootReducer
+
+