Add standalone flag

Author: TimonReinekeCap

exercises/ngrx.html

@@ -66,7 +66,7 @@ <h2>ngrx basics</h2>
             <h2>Basic Setup</h2>
             <ul>
                 <li>Initialize a <a href="https://angular.io/tutorial/toh-pt0" target="_blank">new Angular application</a> with Angular CLI</li>
-                <pre><code>ng new ngrx-exercise</code></pre>
+                <pre><code>ng new ngrx-exercise --standalone false</code></pre>
                 <li>Add <code>@ngrx/store</code> and <code>@ngrx/store-devtools</code> to the dependencies with npm/yarn</li>
                 <li>
                     Download the <a href="https://github.com/reduxjs/redux-devtools">Redux Devtools Extension</a> for