Merge pull request #12868 from RasaHQ/remove-playground-3.6.x

bye bye playground

changelog/12868.doc.md

@@ -0,0 +1 @@
+Remove the Playground from docs.

docs/docs/installation/installing-rasa-open-source.mdx

@@ -9,19 +9,6 @@ import Tabs from "@theme/Tabs";
 import TabItem from "@theme/TabItem";
 import { Button } from "@theme/Button";
 
-:::note Want to explore first?
-You can explore Rasa Open Source online using the Rasa Playground even before you install it.
-At the end of the tutorial, you can download the resulting assistant, install Rasa on
-your machine and continue development locally.
-
-<a
-  className="button button--outline button button"
-  href={useBaseUrl("/playground")}
->
-  Rasa Playground
-</a>
-:::
-
 ## Install Rasa Open Source
 
 <Tabs values={[{"label": "Ubuntu / macOS / Windows", "value": "ubuntu/macos/windows"}]} defaultValue="ubuntu/macos/windows">
@@ -147,7 +134,7 @@ python3 -m spacy download en_core_web_md
 
 :::tip Using `zsh`?
 
-In zsh, square brackets are interpreted as patterns on the command line. 
+In zsh, square brackets are interpreted as patterns on the command line.
 To run commands with square brackets, you can either enclose the arguments
 with square brackets in quotes, like `pip3 install 'rasa[spacy]'`, or escape
 the square brackets using backslashes, like `pip3 install rasa\[spacy\]`.