refactor(demo): update demo views to use commons demo annotations

Author: paodb

src/test/java/com/flowingcode/vaadin/addons/errorwindow/ErrorwindowDemo.java

@@ -21,12 +21,16 @@
 
 package com.flowingcode.vaadin.addons.errorwindow;
 
+import com.flowingcode.vaadin.addons.demo.DemoSource;
 import com.vaadin.flow.component.UI;
 import com.vaadin.flow.component.button.Button;
 import com.vaadin.flow.component.checkbox.Checkbox;
 import com.vaadin.flow.component.notification.Notification;
 import com.vaadin.flow.component.orderedlayout.VerticalLayout;
+import com.vaadin.flow.router.PageTitle;
 
+@PageTitle("Error Window Demo")
+@DemoSource
 @SuppressWarnings("serial")
 public class ErrorwindowDemo extends VerticalLayout {
 

src/test/java/com/flowingcode/vaadin/addons/errorwindow/ErrorwindowDemoView.java

@@ -31,12 +31,8 @@
 @GithubLink("https://github.com/FlowingCode/ErrorWindowAddon")
 public class ErrorwindowDemoView extends TabbedDemo {
 
-  private static final String ERROR_DEMO = "Error Window Demo";
-  private static final String ERROR_SOURCE =
-      "https://github.com/FlowingCode/ErrorWindowAddon/blob/master/src/test/java/com/flowingcode/vaadin/addons/errorwindow/ErrorwindowDemo.java";
-
   public ErrorwindowDemoView() {
-    addDemo(new ErrorwindowDemo(), ERROR_DEMO, ERROR_SOURCE);
+    addDemo(new ErrorwindowDemo());
     setSizeFull();
   }
 }