Point to tooling redirect for debug extension

Author: parlough

dwds/debug_extension/README.md

@@ -0,0 +1,10 @@
+## Dart Debug Extension
+
+The implementation of the [Dart Debug Extension][] for Chrome,
+that enables debugging Dart web apps with [Dart DevTools][] by
+integrating with [`webdev`][] through [DWDS][].
+
+[Dart Debug Extension]: https://dart.dev/to/web-debug-extension
+[Dart DevTools]: https://dart.dev/tools/dart-devtools
+[`webdev`]: https://dart.dev/tools/webdev
+[DWDS]: https://pub.dev/packages/dwds

dwds/debug_extension/pubspec.yaml

@@ -1,7 +1,6 @@
 name: mv3_extension
 publish_to: none
 version: 2.1.4
-homepage: https://github.com/dart-lang/webdev
 description: >-
   A Chrome extension for Dart debugging.
 

dwds/lib/shared/README.md

@@ -1,4 +1,4 @@
 # Shared directory
 
-The files in this directory are shared between DWDS and external packages (e.g.,
-the Dart Debug Extension).
+The files in this directory are shared between DWDS and external packages,
+such as the [Dart Debug Extension](https://dart.dev/to/web-debug-extension).

dwds/web/client.dart

@@ -167,7 +167,7 @@ Future<void>? main() {
           if (!event.success) {
             final alert = 'DevTools failed to open with:\n${event.error}';
             if (event.promptExtension && window.confirm(alert)) {
-              window.open('https://goo.gle/dart-debug-extension', '_blank');
+              window.open('https://dart.dev/to/web-debug-extension', '_blank');
             } else {
               window.alert(alert);
             }

webdev/lib/src/command/serve_command.dart

@@ -35,7 +35,8 @@ refresh: Performs a full page refresh.
         help: 'Enable the launching of DevTools (Alt + D / Option + D). '
             'This also enables --$launchInChromeFlag.')
     ..addFlag(debugExtensionFlag,
-        help: 'Enable the backend for the Dart Debug Extension.')
+        help: 'Enable the backend for the Dart Debug Extension. '
+            'Learn more at https://dart.dev/to/web-debug-extension.')
     ..addFlag(enableInjectedClientFlag,
         help: 'Whether or not to inject the client.js script in web apps. This '
             'is required for all debugging related features, but may interact '