Revise Dart FAQ (dart-lang#5479)

Revised for currency. @MaryaBelanger : Created a draft issue to revisit later. Thanks!

Fixes dart-lang#4673

_config.yml

@@ -42,7 +42,8 @@ gh: https://github.com
 gh-dart: 
   org: https://github.com/dart-lang
   sdk: https://github.com/dart-lang/sdk
-  site: https://github.com/dart-lang/website
+  lang: https://github.com/dart-lang/language
+  site: https://github.com/dart-lang/site-www
 
 show_banner: true
 

src/_data/side-nav.yml

@@ -336,8 +336,6 @@
 - title: Resources
   expanded: false
   children:
-    - title: FAQ
-      permalink: /resources/faq
     - title: Breaking changes
       permalink: /resources/breaking-changes
     - title: Language evolution
@@ -353,6 +351,8 @@
           permalink: /guides/language/coming-from/js-to-dart
         - title: Swift to Dart
           permalink: /guides/language/coming-from/swift-to-dart
+    - title: FAQ
+      permalink: /resources/faq
     - title: Glossary
       permalink: /resources/glossary
     - title: Books

src/_sass/site.scss

@@ -884,3 +884,7 @@ body.obsolete {
     }
   }
 }
+
+dd {
+  margin-left: 1rem;
+}

src/guides/whats-new.md

@@ -285,9 +285,6 @@ we made the following changes to this site:
   * New library directive section in [The language tour][]
 * Improved clarity surrounding Dart's single-threaded or multi-threaded status:
   * Removed the outdated `dart:io` page.
-  * Added two sections to the FAQ:
-    * [Is Dart single-threaded?][]
-    * [Is Dart single-threaded on the web?][]
   * Expanded on [Dart's web concurrency capabilities][].
 * Rearranged and clarified [discussion][] of default values for optional and positional parameters.
 * Updated [Concurrency in Dart][] to default to new `Isolate.run()` function.
@@ -307,7 +304,6 @@ we made the following changes to this site:
 [Automated publishing of packages to pub.dev]: /tools/pub/automated-publishing
 [community resources section]: /community#additional-community-resources
 [migration guide]: /null-safety/migration-guide
-[Sound null safety]: /null-safety#dart-3-and-null-safety
 [unsound null safety]: /null-safety/unsound-null-safety
 [Learning Dart as a Swift developer]: /guides/language/coming-from/swift-to-dart
 [booleans and equality operators]: /effective-dart/usage#dont-use-true-or-false-in-equality-operations

src/resources/index.md

@@ -18,11 +18,6 @@ Check out the following Dart language resources:
     <p>Keeping community spaces safe and respectful.</p>
   </div>
 
-  <div class="card">
-    <h3><a href="/resources/faq">Dart FAQ</a></h3>
-    <p>Answers to questions from the Dart community.</p>
-  </div> 
-
   <div class="card">
     <h3><a href="/resources/videos">Videos</a></h3>
     <p>Videos aimed at Dart developers.</p>

src/tools/dartpad/troubleshoot.md

@@ -16,7 +16,8 @@ The dart.dev homepage and many codelabs have embedded DartPads.
 If these DartPads don't appear at all,
 then try the following:
 
-* Make sure you're using a [supported browser][browser].
+* Make sure you're using one of the latest two versions of Chrome,
+  Edge, Firefox, or Safari.
   DartPad might not work in other browsers, and is known not to work in
   the default configuration of the Brave browser.
 

src/tools/webdev.md

@@ -112,7 +112,8 @@ assets on disk. This makes later builds compile faster.
   The development compiler supports **only Chrome.**
   To view your app in another browser,
   use the production compiler.
-  For a list of supported browsers, [see the FAQ][supported browsers].
+  The production compiler supports the latest two versions of Chrome,
+  Edge, Firefox, and Safari.
 {{site.alert.end}}
 
 To enable [Dart DevTools][], add the `--debug` flag:
@@ -188,7 +189,6 @@ test package runner, use this command:
 $ dart test -h
 ```
 
-
 ## More information
 
 For a complete list of `webdev` options, run `webdev --help` or see the
@@ -205,11 +205,8 @@ Also see the following pages:
   [compiler options](/tools/dart-compile#js).
 
 [build_runner]: /tools/build_runner
-[build_runner test]: #test
 [build_web_compilers]: {{site.pub-pkg}}/build_web_compilers
 [Dart DevTools]: /tools/dart-devtools
 [dev_dependencies]: /tools/pub/dependencies#dev-dependencies
-[PATH]: /tools/pub/cmd/pub-global#running-a-script-from-your-path
-[supported browsers]: /resources/faq#q-what-browsers-do-you-support-as-javascript-compilation-targets
 [test package]: {{site.pub-pkg}}/test
 [webdev]: {{site.pub-pkg}}/webdev