introducing redux and fixing stuff

assets/src/app/store.ts

@@ -0,0 +1,17 @@
+import { configureStore } from "@reduxjs/toolkit";
+
+import AuthReducer from "../features/auth/auth-slice";
+import {cardDeckApiSlice} from "../features/cardDecks/cardDeck-api-slice";
+
+export const store = configureStore({
+  reducer: {
+    auth: AuthReducer,
+    [cardDeckApiSlice.reducerPath]: cardDeckApiSlice.reducer
+  },
+  middleware: (getDefaultMiddleware) => {
+    return getDefaultMiddleware().concat(cardDeckApiSlice.middleware);
+  }
+});
+
+export type AppDispatch = typeof store.dispatch;
+export type RootState = ReturnType<typeof store.getState>;