Initial attempt at combining tutorials and codelabs

firebase.json

@@ -77,6 +77,7 @@
       { "source": "/assets/dart-logo-wordmark*.png", "destination": "/assets/shared/dart-logo-for-shares.png?2", "type": 301 },
       { "source": "/books", "destination": "/resources/books", "type": 301 },
       { "source": "/cloud{,/**}", "destination": "/server/google-cloud", "type": 301 },
+      { "source": "/codelabs", "destination": "/tutorials", "type": 301 },
       { "source": "/codelabs/server{,/**}", "destination": "/tutorials/server/httpserver", "type": 301 },
       { "source": "/code-of-conduct", "destination": "/community/code-of-conduct", "type": 301 },
       { "source": "/concurrency", "destination": "/language/concurrency", "type": 301 },
@@ -124,7 +125,8 @@
       { "source": "/docs/tutorials/httpserver", "destination": "/tutorials/server/httpserver", "type": 301 },
       { "source": "/docs/tutorials/indexeddb{,/**}", "destination": "https://api.dart.dev/stable/dart-indexed_db/dart-indexed_db-library.html", "type": 301 },
       { "source": "/docs/tutorials/remove-elements", "destination": "/tutorials/web/low-level-html/remove-elements", "type": 301 },
-      { "source": "/docs/tutorials/shared-pkgs", "destination": "/tutorials/libraries/shared-pkgs", "type": 301 },
+      { "source": "/docs/tutorials/shared-pkgs", "destination": "/guides/packages", "type": 301 },
+      { "source": "/docs/tutorials/libraries{,/**}", "destination": "/guides/packages", "type": 301 },
       { "source": "/docs/tutorials/streams", "destination": "/tutorials/language/streams", "type": 301 },
       { "source": "/docs/tutorials{,/**}", "destination": "/tutorials", "type": 301 },
       { "source": "/docs{,/**}", "destination": "/guides", "type": 301 },

src/_data/side-nav.yml

@@ -1,23 +1,36 @@
-- title: Tutorials & codelabs
+- title: Tutorials
   expanded: false
   children:
-    - title: Tutorials
+    - title: Introduction
       match-page-url-exactly: true
       permalink: /tutorials
-    - title: Codelabs
-      expanded: true
+    - title: Language
+      expanded: false
       children:
-        - title: List of Dart codelabs
-          match-page-url-exactly: true
-          permalink: /codelabs
-        - title: Language cheatsheet
-          permalink: /codelabs/dart-cheatsheet
+      - title: Koans (code exercises)
+        permalink: /codelabs/dart-cheatsheet
+      - title: Null safety
+        permalink: /codelabs/null-safety
+      - title: Coming from ...
+        expanded: false
+        children:
+          - title: JavaScript to Dart
+            permalink: /guides/language/coming-from/js-to-dart
+          - title: Swift to Dart
+            permalink: /guides/language/coming-from/swift-to-dart
+          - title: Java to Dart
+            permalink: https://codelabs.developers.google.com/codelabs/from-java-to-dart/
+    - title: Libraries
+      expanded: false
+      children:
+        - title: Library tour
+          permalink: /guides/libraries/library-tour
         - title: Iterable collections
           permalink: /codelabs/iterables
         - title: Asynchronous programming
           permalink: /codelabs/async-await
-        - title: Null safety
-          permalink: /codelabs/null-safety
+    - title: Building a command-line app
+      permalink: /tutorials/server/get-started
 - title: Language
   expanded: false
   children:
@@ -332,13 +345,6 @@
       permalink: /guides/language/spec    
     - title: Dart 3 migration guide
       permalink: /resources/dart-3-migration
-    - title: Coming from ...
-      expanded: false
-      children:
-        - title: JavaScript to Dart
-          permalink: /guides/language/coming-from/js-to-dart
-        - title: Swift to Dart
-          permalink: /guides/language/coming-from/swift-to-dart
     - title: Books
       permalink: /resources/books
     - title: Videos

src/_tutorials/index.md

@@ -3,10 +3,27 @@ title: Tutorials
 description: Tutorials for writing Dart apps.
 ---
 
-These tutorials teach you how to use the Dart
-language, tools, and APIs to build applications.
-If you want a hands-on coding experience, try a
-**[codelab](/codelabs)**.
+Welcome to the Dart tutorials! 
+These teach you how to use the Dart
+language, libraries, and tools build applications.
+
+## Language
+
+If you like learning via coding exercises 
+checkout the [Dart koans](/codelabs/dart-cheatsheet).
+For a more textual introduction see the 
+[language intro](/language). 
+The Language menu on the left also has tutorials
+on more detailed topics, and tutorials written
+for those with existing knowledge of other programming languages.
+
+## Libraries
+
+The Libraries menu contains tutorials on the Dart core libraries,
+including collections, math, asynchronous programming, and I/O.
+
+
+
 
 ## The basics