Demos: Remove silly HelloWorld2 demo

This was just a tiny test app made with the old VisualBuilder. It's not
really useful for anything.

Demos/HelloWorld2/.gitignore

@@ -1 +0,0 @@
-UI_*.h

Demos/HelloWorld2/HelloWorld2.frm

@@ -1 +0,0 @@
-{"name":"HelloWorld2","widgets":[{"name":"w1","tooltip":null,"backcolor":"#d4d0c8ff","forecolor":"#000000ff","text":"Hello world!","class":"GUI::Label","autofill":true,"enabled":true,"visible":true,"x":5,"height":26,"y":5,"width":121},{"name":"w2","tooltip":null,"backcolor":"#d4d0c8ff","forecolor":"#000000ff","text":"Lefty","class":"GUI::Button","autofill":false,"enabled":true,"visible":true,"x":5,"height":26,"y":40,"width":51},{"name":"w3","tooltip":null,"backcolor":"#d4d0c8ff","forecolor":"#000000ff","text":"Righty","class":"GUI::Button","autofill":false,"enabled":true,"visible":true,"x":80,"height":26,"y":40,"width":51},{"name":"w4","enabled":true,"forecolor":"#000000ff","checked":false,"autofill":false,"x":150,"tooltip":null,"height":26,"width":91,"y":5,"class":"GUI::CheckBox","text":"Awesome","backcolor":"#d4d0c8ff","visible":true},{"name":"w5","enabled":true,"forecolor":"#000000ff","checked":false,"autofill":false,"x":150,"tooltip":null,"height":26,"width":51,"y":30,"class":"GUI::CheckBox","text":"Cool","backcolor":"#d4d0c8ff","visible":true}]}

Demos/HelloWorld2/Makefile

@@ -1,13 +0,0 @@
-OBJS = \
-    main.o
-
-PROGRAM = HelloWorld2
-
-LIB_DEPS = GUI IPC Gfx Core
-
-main.cpp: UI_HelloWorld2.h
-
-UI_HelloWorld2.h: HelloWorld2.frm | FORMCOMPILER
-	$(QUIET) $(FORMCOMPILER) $< > $@
-
-include ../../Makefile.common

Demos/HelloWorld2/main.cpp

@@ -1,52 +0,0 @@
-/*
- * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this
- *    list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include <LibGUI/Application.h>
-#include <LibGUI/BoxLayout.h>
-#include <LibGUI/Button.h>
-#include <LibGUI/Label.h>
-#include <LibGUI/Widget.h>
-#include <LibGUI/Window.h>
-#include "UI_HelloWorld2.h"
-
-int main(int argc, char** argv)
-{
-    GUI::Application app(argc, argv);
-
-    auto window = GUI::Window::construct();
-    window->set_rect(100, 100, 240, 160);
-    window->set_title("Hello World!");
-
-    auto* ui = new UI_HelloWorld2;
-    window->set_main_widget(ui->main_widget);
-
-    ui->w3->on_click = [&](auto&) {
-        app.quit();
-    };
-
-    window->show();
-    return app.exec();
-}

Kernel/build-root-filesystem.sh

@@ -138,7 +138,6 @@ cp ../Applications/Welcome/Welcome mnt/bin/Welcome
 cp ../Applications/Help/Help mnt/bin/Help
 cp ../Applications/Browser/Browser mnt/bin/Browser
 cp ../Demos/HelloWorld/HelloWorld mnt/bin/HelloWorld
-cp ../Demos/HelloWorld2/HelloWorld2 mnt/bin/HelloWorld2
 cp ../Demos/WidgetGallery/WidgetGallery mnt/bin/WidgetGallery
 cp ../Demos/Fire/Fire mnt/bin/Fire
 cp ../Demos/DynamicLink/LinkDemo/LinkDemo mnt/bin/LinkDemo
@@ -171,7 +170,6 @@ echo "done"
 printf "installing shortcuts... "
 ln -s FileManager mnt/bin/fm
 ln -s HelloWorld mnt/bin/hw
-ln -s HelloWorld2 mnt/bin/hw2
 ln -s IRCClient mnt/bin/irc
 ln -s Minesweeper mnt/bin/ms
 ln -s Shell mnt/bin/sh