[3.35] Add a quick version of getting started (#12052)

**Dependent on hot reload for web not being behind a flag.**

Introduces a new get started flow that is shorter and focuses on
installing Flutter, VS Code, and Chrome then trying out Flutter and hot
reload on the web. New adding a new target platform docs have been added
in preparation for this and are linked to at the end of the doc.

Contributes to #11911

**Staged:**
https://flutter-docs-prod--pr12052-feat-get-started-quickly-zw2vhwsv.web.app/get-started/quick

---------

Co-authored-by: Amanda Fitch <[email protected]>

Author: parlough

firebase.json

@@ -807,6 +807,7 @@
       { "source": "/to/state-management-sample", "destination": "/data-and-backend/state-mgmt/simple", "type": 301 },
       { "source": "/to/switch-flutter-version", "destination": "/install/upgrade#switch-to-a-specific-flutter-version", "type": 301 },
       { "source": "/to/team-infra", "destination": "https://github.com/flutter/flutter/blob/main/docs/triage/Infra-Triage.md", "type": 301 },
+      { "source": "/to/test-drive", "destination": "/get-started/quick", "type": 301 },
       { "source": "/to/track-widget-creation", "destination": "/tools/devtools/inspector#track-widget-creation", "type": 301 },
       { "source": "/to/troubleshoot-devices", "destination": "/get-started/install", "type": 301 },
       { "source": "/to/unbounded-constraints", "destination": "/ui/layout/constraints#unbounded", "type": 301 },

src/content/assets/images/docs/get-started/increment-button.png

@@ -1,7 +1,9 @@
 ---
 title: Choose your development platform to get started
 short-title: Install
-description: Install Flutter and get started. Downloads available for Windows, macOS, Linux, and ChromeOS operating systems.
+description: >-
+  Install Flutter and get started developing!
+  Downloads available for Windows, macOS, Linux, and ChromeOS operating systems.
 os-list: [Windows, macOS, Linux, ChromeOS]
 js: [{url: '/assets/js/page/install-current.js'}]
 ---
@@ -19,4 +21,13 @@ js: [{url: '/assets/js/page/install-current.js'}]
 {% endfor %}
 </div>
 
+:::tip Planning to use VS Code?
+Are you planning to use VS Code to develop Flutter apps?
+
+Try out the streamlined getting-started experience
+outlined in [Set up and test drive Flutter][]!
+
+[Set up and test drive Flutter]: /get-started/quick
+:::
+
 {% render docs/china-notice.md %}