refactor(demo): move demo-styles to frontend/styles/app-layout

Author: ngonzalezpazFC

src/test/java/com/flowingcode/addons/applayout/ApplayoutDemoView.java

@@ -11,8 +11,8 @@
 import com.vaadin.flow.component.Component;
 import com.vaadin.flow.component.button.Button;
 import com.vaadin.flow.component.checkbox.Checkbox;
-import com.vaadin.flow.component.dependency.CssImport;
 import com.vaadin.flow.component.dependency.HtmlImport;
+import com.vaadin.flow.component.dependency.StyleSheet;
 import com.vaadin.flow.component.dialog.Dialog;
 import com.vaadin.flow.component.html.Div;
 import com.vaadin.flow.component.html.H3;
@@ -30,7 +30,7 @@
 @SuppressWarnings("serial")
 @Route(value = "applayout", layout = DemoLayout.class)
 @HtmlImport("frontend://styles/shared-styles.html")
-@CssImport("./styles/app-layout/demo-styles.css")
+@StyleSheet("context://frontend/styles/app-layout/demo-styles.css")
 public class ApplayoutDemoView extends VerticalLayout {
 
 	private VerticalLayout container = new VerticalLayout();