Revert "Merge branch 'documentation'"7.6.0.beta2

This reverts commit f6874bde3d945c8b2d1b5c17ab50e2d0f1f8ff00.

Change-Id: I67ee1c30ba3e3bcc3c43a1dd2e73a822791514bf

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diff --git a/documentation/introduction/intro-walkthrough.asciidoc b/documentation/introduction/intro-walkthrough.asciidoc
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----
-title: Example Application Walkthrough
-order: 2
-layout: page
----
-
-[[intro.walkthrough]]
-= Example Application Walkthrough
-
-Let us follow the long tradition of first saying "Hello World!" when learning a
-new programming framework. First, using the primary server-side API.
-
-
-[source, java]
-----
-import com.vaadin.server.VaadinRequest;
-import com.vaadin.ui.Label;
-import com.vaadin.ui.UI;
-
-@Title("My UI")
-@Theme("valo")
-public class HelloWorld extends UI {
-    @Override
-    protected void init(VaadinRequest request) {
-        // Create the content root layout for the UI
-        VerticalLayout content = new VerticalLayout();
-        setContent(content);
-
-        // Display the greeting
-        content.addComponent(new Label("Hello World!"));
-
-        // Have a clickable button        
-        content.addComponent(new Button("Push Me!",
-            new ClickListener() {
-                @Override
-                public void buttonClick(ClickEvent e) {
-                    Notification.show("Pushed!");
-                }
-            }));
-    }
-}
-----
-
-A Vaadin application has one or more __UI__s that extend the
-[classname]#com.vaadin.ui.UI# class. A UI is a part of the web page in which the
-Vaadin application runs. An application can have multiple UIs in the same page,
-especially in portals, or in different windows or tabs. A UI is associated with
-a user session, and a session is created for each user who uses the application.
-In the context of our Hello World UI, it is sufficient to know that the
-underlying session is created when the user first accesses the application by
-opening the page, and the [methodname]#init()# method is invoked at that time.
-
-The page title, which is shown in the caption of the browser window or tab, is
-defined with an annotation. The example uses a layout component as the root
-content of the UI, as that is the case with most Vaadin applications, which
-normally have more than one component. It then creates a new [classname]#Label#
-user interface component, which displays simple text, and sets the text to
-"Hello World!". The label is added to the layout.
-
-The example also shows how to create a button and handle button click events.
-Event handling is described in
-<<dummy/../../../framework/architecture/architecture-events#architecture.events,"Events
-and Listeners">> and on the practical side in
-<<dummy/../../../framework/application/application-events#application.events,"Handling
-Events with Listeners">>. In addition to listeners, in Java 8 you can handle
-events with lambda expressions, which simplifies the handler code significantly.
-
-
-[source, java]
-----
-content.addComponent(new Button("Push Me!",
-    event -> Notification.show("Pushed!")));
-----
-
-The result of the Hello World application, when opened in a browser, is shown in
-<<figure.intro.walkthrough>>.
-
-[[figure.intro.walkthrough]]
-.Hello World Application
-image::img/HelloWorld.png[]
-
-To run a program, you need to package it as a web application WAR package and
-deploy it to a server, as explained in
-<<dummy/../../../framework/application/application-environment#application.environment,"Deploying
-an Application">>. During development, you typically deploy to an application
-server integrated with the IDE.
-
-Developing a pure client-side application, you could write a Hello World just as
-easily, and also in Java:
-
-
-[source, java]
-----
-public class HelloWorld implements EntryPoint {
-    @Override
-    public void onModuleLoad() {
-        RootPanel.get().add(new Label("Hello, world!"));
-    }
-}
-----
-
-We do not set the title here, because it is usually defined in the HTML page in
-which the code is executed. The application would be compiled into JavaScript
-with the Vaadin Client Compiler (or GWT Compiler). It is more typical, however,
-to write client-side widgets, which you can then use from a server-side Vaadin
-application. For more information regarding client-side development, see
-<<dummy/../../../framework/clientside/clientside-overview.asciidoc#clientside.overview,"Client-Side
-Vaadin Development">>.
-
-
-