Move example fn widgets into sky/framework/components

sky/examples/fn/widgets/button.dart

Index: sky/examples/fn/widgets/button.dart
diff --git a/sky/examples/fn/widgets/button.dart b/sky/examples/fn/widgets/button.dart
deleted file mode 100644
index 17ffa2524bc9f001fe348865d232ee76a69e81f2..0000000000000000000000000000000000000000
--- a/sky/examples/fn/widgets/button.dart
+++ /dev/null
@@ -1,39 +0,0 @@
-part of widgets;
-
-class Button extends ButtonBase {
-
-  static Style _style = new Style('''
-    transform: translateX(0);
-    display: inline-flex;
-    border-radius: 4px;
-    justify-content: center;
-    align-items: center;
-    border: 1px solid blue;
-    -webkit-user-select: none;
-    margin: 5px;'''
-  );
-
-  static Style _highlightStyle = new Style('''
-    transform: translateX(0);
-    display: inline-flex;
-    border-radius: 4px;
-    justify-content: center;
-    align-items: center;
-    border: 1px solid blue;
-    -webkit-user-select: none;
-    margin: 5px;
-    background-color: orange;'''
-  );
-
-  Node content;
-
-  Button({ Object key, this.content }) : super(key: key);
-
-  Node build() {
-    return new Container(
-      key: 'Button',
-      style: _highlight ? _highlightStyle : _style,
-      children: [super.build(), content]
-    );
-  }
-}