fix links to new website

examples/README.md

@@ -6,7 +6,7 @@ individual Dart application package.
 
 To run a sample with the `flutter` tool, run `pub get` inside its directory,
 then run `flutter start`. (See the
-[getting started guide](https://flutter.github.io/getting-started/) to install
+[getting started guide](https://flutter.io/getting-started/) to install
 the `flutter` tool.)
 
 Available examples include:

examples/material_gallery/README.md

@@ -8,5 +8,5 @@ Icon was generated using Android Asset Studio:
 https://romannurik.github.io/AndroidAssetStudio/icons-launcher.html#foreground.type=image&foreground.space.trim=0&foreground.space.pad=0.1&foreColor=607d8b%2C0&crop=0&backgroundShape=square&backColor=ffffff%2C100&effects=none
 
 From the Flutter Logo:
-https://github.com/flutter/flutter.github.io/blob/master/_includes/logo.html
+https://github.com/flutter/website/blob/master/_includes/logo.html
 which appears to be CC-BY 4.0.

packages/flutter/README.md

@@ -5,5 +5,5 @@ Flutter is a new way to build high-performance, cross-platform mobile apps.
 Flutter is optimized for today's, and tomorrow's, mobile devices. We are
 focused on low-latency input and high frame rates on Android and iOS.
 
-See the [getting started guide](https://flutter.github.io/getting-started/) for
+See the [getting started guide](https://flutter.io/getting-started/) for
 information about using Flutter.

packages/flutter/lib/src/rendering/box.dart

@@ -534,7 +534,7 @@ abstract class RenderBox extends RenderObject {
     assert(constraints != null);
     assert(_size != null);
     assert(() {
-      'See https://flutter.github.io/layout/#unbounded-constraints';
+      'See https://flutter.io/layout/#unbounded-constraints';
       return !_size.isInfinite;
     });
     bool result = constraints.isSatisfiedBy(_size);

packages/flutter/lib/src/rendering/flex.dart

@@ -352,7 +352,7 @@ class RenderFlex extends RenderBox with ContainerRenderObjectMixin<RenderBox, Fl
         // Flexible children can only be used when the RenderFlex box's container has a finite size.
         // When the container is infinite, for example if you are in a scrollable viewport, then
         // it wouldn't make any sense to have a flexible child.
-        assert(canFlex && 'See https://flutter.github.io/layout/#flex' is String);
+        assert(canFlex && 'See https://flutter.io/layout/#flex' is String);
         totalFlex += childParentData.flex;
       } else {
         BoxConstraints innerConstraints;