Removing live examples of tutorial code that are no longer hosted (#9363)

* docs: Removing live examples of tutorial code that are no longer hosted

* docs: Remove all references to tutorial links

Author: TGoddessana

README.md

@@ -45,8 +45,6 @@ Some reasons you might want to use REST framework:
 * Customizable all the way down - just use [regular function-based views][functionview-section] if you don't need the [more][generic-views] [powerful][viewsets] [features][routers].
 * [Extensive documentation][docs], and [great community support][group].
 
-There is a live example API for testing purposes, [available here][sandbox].
-
 **Below**: *Screenshot from the browsable API*
 
 ![Screenshot][image]
@@ -188,7 +186,6 @@ Please see the [security policy][security-policy].
 [pypi]: https://pypi.org/project/djangorestframework/
 [twitter]: https://twitter.com/starletdreaming
 [group]: https://groups.google.com/forum/?fromgroups#!forum/django-rest-framework
-[sandbox]: https://restframework.herokuapp.com/
 
 [funding]: https://fund.django-rest-framework.org/topics/funding/
 [sponsors]: https://fund.django-rest-framework.org/topics/funding/#our-sponsors

docs/community/project-management.md

@@ -199,7 +199,6 @@ If `@tomchristie` ceases to participate in the project then `@j4mie` has respons
 The following issues still need to be addressed:
 
 * Ensure `@jamie` has back-up access to the `django-rest-framework.org` domain setup and admin.
-* Document ownership of the [live example][sandbox] API.
 * Document ownership of the [mailing list][mailing-list] and IRC channel.
 * Document ownership and management of the security mailing list.
 
@@ -208,5 +207,4 @@ The following issues still need to be addressed:
 [transifex-project]: https://www.transifex.com/projects/p/django-rest-framework/
 [transifex-client]: https://pypi.org/project/transifex-client/
 [translation-memory]: http://docs.transifex.com/guides/tm#let-tm-automatically-populate-translations
-[sandbox]: https://restframework.herokuapp.com/
 [mailing-list]: https://groups.google.com/forum/#!forum/django-rest-framework

docs/index.md

@@ -247,7 +247,6 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 [serializer-section]: api-guide/serializers#serializers
 [modelserializer-section]: api-guide/serializers#modelserializer
 [functionview-section]: api-guide/views#function-based-views
-[sandbox]: https://restframework.herokuapp.com/
 [sponsors]: https://fund.django-rest-framework.org/topics/funding/#our-sponsors
 
 [quickstart]: tutorial/quickstart.md

docs/tutorial/1-serialization.md

@@ -8,7 +8,7 @@ The tutorial is fairly in-depth, so you should probably get a cookie and a cup o
 
 ---
 
-**Note**: The code for this tutorial is available in the [encode/rest-framework-tutorial][repo] repository on GitHub.  The completed implementation is also online as a sandbox version for testing, [available here][sandbox].
+**Note**: The code for this tutorial is available in the [encode/rest-framework-tutorial][repo] repository on GitHub. Feel free to clone the repository and see the code in action.
 
 ---
 
@@ -307,7 +307,7 @@ Quit out of the shell...
     Validating models...
 
     0 errors found
-    Django version 4.0, using settings 'tutorial.settings'
+    Django version 5.0, using settings 'tutorial.settings'
     Starting Development server at http://127.0.0.1:8000/
     Quit the server with CONTROL-C.
 
@@ -371,7 +371,6 @@ We'll see how we can start to improve things in [part 2 of the tutorial][tut-2].
 
 [quickstart]: quickstart.md
 [repo]: https://github.com/encode/rest-framework-tutorial
-[sandbox]: https://restframework.herokuapp.com/
 [venv]: https://docs.python.org/3/library/venv.html
 [tut-2]: 2-requests-and-responses.md
 [httpie]: https://github.com/httpie/httpie#installation