Update blog links (#12423)

_Description of what this PR is changing or adding, and why:_

Update blog links to new blog subdomain

_Issues fixed by this PR (if any):_

n/a

_PRs or commits this PR depends on (if any):_

none

## Presubmit checklist

- [x] If you are unwilling, or unable, to sign the CLA, even for a
_tiny_, one-word PR, please file an issue instead of a PR.
- [x] If this PR is not meant to land until a future stable release,
mark it as draft with an explanation.
- [x] This PR follows the [Google Developer Documentation Style
Guidelines](https://developers.google.com/style)—for example, it doesn't
use _i.e._ or _e.g._, and it avoids _I_ and _we_ (first-person
pronouns).
- [x] This PR uses [semantic line
breaks](https://github.com/dart-lang/site-shared/blob/main/doc/writing-for-dart-and-flutter-websites.md#semantic-line-breaks)
  of 80 characters or fewer.

Author: mit-mit

CONTRIBUTING.md

@@ -44,7 +44,7 @@ Other ways you can contribute:
 * [Request docs for docs.flutter.dev][doc-issues]
 * [Submit PRs to docs.flutter.dev][doc-PRs]
 * [Follow us on Twitter: @flutterdev](https://twitter.com/flutterdev/)
-* [Read the Flutter Publication on Medium](https://medium.com/flutter)
+* [Read the Flutter Publication on Medium](https://blog.flutter.dev)
 * [Sign up to Future UX Studies on Flutter](https://flutter.dev/research-signup)
 * [Join the subreddit to keep up with the latest in the Flutter
    community][reddit]

firebase.json

@@ -240,8 +240,8 @@
 
       { "source": "/adoptawidget", "destination": "https://github.com/flutter/flutter/blob/main/CONTRIBUTING.md", "type": 301 },
       { "source": "/apprentice-giveaway", "destination": "https://www.youtube.com/playlist?list=PL4dBIh1xps-HAaadBRWQobCO_IJ4gMOG2", "type": 301 },
-      { "source": "/clock", "destination": "https://medium.com/flutter/its-time-the-flutter-clock-contest-results-dcebe2eb3957", "type": 301 },
-      { "source": "/create", "destination": "https://medium.com/flutter/the-flutter-create-winners-are-40980f2d20b3", "type": 301 },
+      { "source": "/clock", "destination": "https://blog.flutter.dev/its-time-the-flutter-clock-contest-results-dcebe2eb3957", "type": 301 },
+      { "source": "/create", "destination": "https://blog.flutter.dev/the-flutter-create-winners-are-40980f2d20b3", "type": 301 },
       { "source": "/assets/images/docs/intellij/hot-reload.gif", "destination": "https://raw.githubusercontent.com/flutter/website/main/src/assets/images/docs/tools/android-studio/hot-reload.gif", "type": 301 },
       { "source": "/brick-breaker", "destination": "https://codelabs.developers.google.com/codelabs/flutter-flame-brick-breaker", "type": 301 },
       { "source": "/catalog/samples", "destination": "https://flutter.github.io/samples/#", "type": 301 },

src/_data/site.yml

@@ -36,7 +36,7 @@ main-api: https://main-api.flutter.dev
 pub: https://pub.dev
 pub-api: https://pub.dev/documentation
 pub-pkg: https://pub.dev/packages
-flutter-medium: https://medium.com/flutter
+flutter-medium: https://blog.flutter.dev
 medium: https://medium.com
 dartpad: https://dartpad.dev
 gallery-archive: https://flutter-gallery-archive.web.app

src/_includes/banner.html

@@ -1 +1 @@
-Flutter 3.35 has landed! Get ready for a performance boost and stateful hot reload on the web. <a href="https://medium.com/flutter/whats-new-in-flutter-3-35-c58ef72e3766" target="_blank">Learn more</a><br>
+Flutter 3.35 has landed! Get ready for a performance boost and stateful hot reload on the web. <a href="https://blog.flutter.dev/whats-new-in-flutter-3-35-c58ef72e3766" target="_blank">Learn more</a><br>

src/content/llms.txt

@@ -18,7 +18,7 @@ This file provides a curated list of resources to help Large Language Models und
 ## Latest release
 
 - [Announcing Flutter 3.35](https://medium.com/flutter/whats-new-in-flutter-3-35-c58ef72e3766): The official announcement for the 3.35 release.
-- [Announcing Dart 3.9](https://medium.com/dartlang/announcing-dart-3-9-ba49e8f38298): The official announcement for the 3.9 release.
+- [Announcing Dart 3.9](https://blog.dart.dev/announcing-dart-3-9-ba49e8f38298): The official announcement for the 3.9 release.
 
 ## Learning resources
 
@@ -173,7 +173,7 @@ This file provides a curated list of resources to help Large Language Models und
 - [Flutter blog](https://medium.com/flutter): The official blog for the Flutter project.
 - [Flutter release notes](https://docs.flutter.dev/release/release-notes): Detailed notes on what's new in each release.
 - [Flutter breaking changes and migration guides](https://docs.flutter.dev/release/breaking-changes): Documentation for breaking changes with each release along with guides for migrating code across a breaking change.
-- [Dart blog](https://medium.com/dartlang): The official blog for the Dart language.
+- [Dart blog](https://blog.dart.dev): The official blog for the Dart language.
 - [Dart breaking changes](https://dart.dev/resources/breaking-changes): A list of breaking changes for each Dart release.
 
 ## API reference

src/content/perf/best-practices.md

@@ -455,4 +455,4 @@ For more performance info, check out the following resources:
 [Performance optimizations]: {{site.api}}/flutter/widgets/AnimatedBuilder-class.html#performance-optimizations
 [Performance considerations for opacity animation]: {{site.api}}/flutter/widgets/Opacity-class.html#performance-considerations-for-opacity-animation
 [`RenderObject`]: {{site.api}}/flutter/rendering/RenderObject-class.html
-[best-practices-medium]: https://medium.com/flutter/best-practices-for-optimizing-flutter-web-loading-speed-7cc0df14ce5c
+[best-practices-medium]: https://blog.flutter.dev/best-practices-for-optimizing-flutter-web-loading-speed-7cc0df14ce5c

src/content/release/release-notes/release-notes-0.0.21-1.0.0.md

@@ -106,7 +106,7 @@ _This page is a dump of the old Changelog page from the Flutter wiki up until
 ## Changes in v0.6.0 (since v0.5.1) - beta 6
 
 ### v0.6.0
-* Dart SDK updated to a Dart 2 build (2.1.0-dev.0.0). Package and plugin authors should ensure their `pubspec.yaml` files include a Dart SDK constraint with an upper bound of `<3.0.0`. See the [Getting ready for Dart 2 post](https://medium.com/dartlang/getting-ready-for-dart-2-and-making-your-packages-look-great-on-the-pub-site-118464d7f59d) for details.
+* Dart SDK updated to a Dart 2 build (2.1.0-dev.0.0). Package and plugin authors should ensure their `pubspec.yaml` files include a Dart SDK constraint with an upper bound of `<3.0.0`. See the [Getting ready for Dart 2 post](https://blog.dart.dev/getting-ready-for-dart-2-and-making-your-packages-look-great-on-the-pub-site-118464d7f59d) for details.
 * [#19025](https://github.com/flutter/flutter/pull/19025) renamed `CupertinoRefreshControl` to `CupertinoSliverRefreshControl` for consistency.
 * [#19317](https://github.com/flutter/flutter/pull/19317) Add cursorWidth and cursorRadius to TextField (Material) cursor.
 * [#20116](https://github.com/flutter/flutter/pull/20116) reduced release binary sizes by ~2MB

src/content/release/release-notes/release-notes-1.12.13.md

@@ -1143,7 +1143,7 @@ check out this [TweenAnimationBuilder video](https://www.youtube.com/watch?reloa
 
 ## Web
 
-We increased our support for web, moving it from the dev channel to the beta channel. For more details, please check [web support blog post](https://medium.com/flutter/web-support-for-flutter-goes-beta-35b64a1217c0).
+We increased our support for web, moving it from the dev channel to the beta channel. For more details, please check [web support blog post](https://blog.flutter.dev/web-support-for-flutter-goes-beta-35b64a1217c0).
 
 [37819]({{site.repo.flutter}}/pull/37819) Add HtmlElementView (the Flutter Web platform view)