Clean email validation

Validation is still not working properly and will be improved in next versions

src/App.tsx

@@ -4,12 +4,10 @@ import { AuthUser } from './components/AuthUser/AuthUser';
 
 export const App: FC = () => (
   <Router>
-    <Switch>
-      <Route path="/">
-        <div data-testid="App">
-          <AuthUser />
-        </div>
-      </Route>
-    </Switch>
+    <div data-testid="App">
+      <Switch>
+        <Route exact path="/" component={AuthUser} />
+      </Switch>
+    </div>
   </Router>
 );