Replace flutter.io with flutter.dev (flutter#30562)

Author: Tim Sneath

.github/ISSUE_TEMPLATE/ACTIVATION.md

@@ -10,13 +10,13 @@ about: You have run into problems while downloading or installing Flutter, or th
 
      If you are looking for support, please check out our documentation
      or consider asking a question on Stack Overflow:
-      * https://flutter.io/
+      * https://flutter.dev/
       * https://docs.flutter.io/
       * https://stackoverflow.com/questions/tagged/flutter?sort=frequent
 
      If you have found a bug or if our documentation doesn't have an answer
      to what you're looking for, then fill our the template below. Please read
-     our guide to filing a bug first:  https://flutter.io/bug-reports/
+     our guide to filing a bug first:  https://flutter.dev/bug-reports/
 -->
 
 ## Steps to Reproduce

.github/ISSUE_TEMPLATE/BUG.md

@@ -9,13 +9,13 @@ about: You are writing an application with Flutter but the application is crashi
 
      If you are looking for support, please check out our documentation
      or consider asking a question on Stack Overflow:
-      * https://flutter.io/
+      * https://flutter.dev/
       * https://docs.flutter.io/
       * https://stackoverflow.com/questions/tagged/flutter?sort=frequent
 
      If you have found a bug or if our documentation doesn't have an answer
      to what you're looking for, then fill our the template below. Please read
-     our guide to filing a bug first:  https://flutter.io/bug-reports/
+     our guide to filing a bug first:  https://flutter.dev/bug-reports/
 -->
 
 ## Steps to Reproduce

.github/ISSUE_TEMPLATE/SUPPORT.md

@@ -8,7 +8,7 @@ about: You have a question for how to achieve a particular effect, or you need h
 <!-- Thank you for using Flutter!
 
      Please check out our documentation first:
-      * https://flutter.io/
+      * https://flutter.dev/
       * https://docs.flutter.io/
 
      If you can't find the answer there, please consider asking a question on

CONTRIBUTING.md

@@ -21,7 +21,7 @@ our trust and demonstrated a commitment to Flutter.
 This document focuses on what is needed to contribute by writing code
 and submitting pull requests for the Flutter framework. For
 information on contributing in other ways, see [the community page
-on flutter.io](https://flutter.io/community).
+on flutter.dev](https://flutter.dev/community).
 
 Developing for Flutter
 ----------------------
@@ -50,17 +50,17 @@ presented.
    which describes the steps you need to configure your computer to
    work on Flutter's framework. Flutter's framework uses mainly Dart.
 
-4. [Tree hygiene](https://github.com/flutter/flutter/wiki/Tree-hygiene),
+5. [Tree hygiene](https://github.com/flutter/flutter/wiki/Tree-hygiene),
    which covers how to land a PR, how to do code review, how to
    handle breaking changes, how to handle regressions, and how to
    handle post-commit test failures.
 
-3. [Issue hygiene](https://github.com/flutter/flutter/wiki/Issue-hygiene),
+6. [Issue hygiene](https://github.com/flutter/flutter/wiki/Issue-hygiene),
    which covers our processes around triaging bugs, escalating high
    priority bugs, assigning bugs, and our GitHub labels and
    milestones.
 
-5. [Our style guide](https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo),
+7. [Our style guide](https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo),
    which includes advice for designing APIs for Flutter, and how to
    format code in the framework.
 

bin/internal/update_dart_sdk.ps1

@@ -28,7 +28,7 @@ $psMajorVersionRequired = 5
 $psMajorVersionLocal = $PSVersionTable.PSVersion.Major
 if ($psMajorVersionLocal -lt $psMajorVersionRequired) {
     Write-Host "Flutter requires PowerShell $psMajorVersionRequired.0 or newer."
-    Write-Host "See https://flutter.io/docs/get-started/install/windows for more."
+    Write-Host "See https://flutter.dev/docs/get-started/install/windows for more."
     return
 }
 

bin/internal/update_dart_sdk.sh

@@ -74,7 +74,7 @@ if [ ! -f "$ENGINE_STAMP" ] || [ "$ENGINE_VERSION" != `cat "$ENGINE_STAMP"` ]; t
     echo
     echo "Failed to retrieve the Dart SDK from: $DART_SDK_URL"
     echo "If you're located in China, please see this page:"
-    echo "  https://flutter.io/community/china"
+    echo "  https://flutter.dev/community/china"
     echo
     rm -f -- "$DART_SDK_ZIP"
     exit 1

dev/ci/docker_linux/Dockerfile

@@ -1,4 +1,4 @@
-# Flutter (https://flutter.io) Developement Environment for Linux
+# Flutter (https://flutter.dev) Developement Environment for Linux
 # ===============================================================
 #
 # This environment passes all Linux Flutter Doctor checks and is sufficient

dev/devicelab/lib/tasks/perf_tests.dart

@@ -274,7 +274,7 @@ class CompileTest {
         await flutter('build', options: options);
         watch.stop();
         final String appPath =  '$cwd/build/ios/Release-iphoneos/Runner.app/';
-        // IPAs are created manually, https://flutter.io/ios-release/
+        // IPAs are created manually, https://flutter.dev/ios-release/
         await exec('tar', <String>['-zcf', 'build/app.ipa', appPath]);
         releaseSizeInBytes = await file('$cwd/build/app.ipa').length();
         if (reportPackageContentSizes)

dev/docs/dashing.json

@@ -3,7 +3,7 @@
   "package": "flutter",
   "author": {
     "name": "The Flutter Team",
-    "link": "https://flutter.io"
+    "link": "https://flutter.dev"
   },
   "index": "index.html",
   "icon32x32": "flutter/static-assets/favicon.png",