Merge branch '228-update-error-pages' into 'develop'

Resolve "Update error pages"

See merge request !67

src/app/shared/page-not-found/page-not-found.component.css

 .container-fluid {
-    min-height: 100vh;
+    min-height: 55vh;
     padding: 25px;
     background-repeat: no-repeat;
     background-color: rgb(255, 255, 255);

src/app/shared/page-not-found/page-not-found.component.html

@@ -3,7 +3,7 @@
     <img src="assets/images/error/404.gif" width="60%">
   </div>
   <div class="row">
-    <h1>Oops! Something went wrong.</h1>
+    <h1>Oops! Something went wrong (404).</h1>
     <p>Our robot couldn't find this page. Try a different link or head back to the homepage.</p>
     <button class="btn btn-primary" type="button" (click)="redirect()">Go back</button>
   </div>