docs: adds code push quickstart guide

docs/architecture.md

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 ---
-sidebar_position: 5
+sidebar_position: 6
 title: 🏛️ Architecture
 description: How Shorebird works.
 ---

docs/faq.md

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-sidebar_position: 4
+sidebar_position: 5
 title: ❓ FAQ
 description: Frequently asked questions.
 ---

docs/guides/_category_.json

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+{
+  "label": "🗺️ Guides",
+  "position": 3,
+  "link": {
+    "title": "Guides",
+    "slug": "guides",
+    "type": "generated-index",
+    "description": "A collection of guides that help you get the most out of Shorebird."
+  }
+}

docs/guides/code_push_quickstart.md

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+---
+sidebar_position: 1
+title: ☄️ Code Push Quickstart
+description: Try code push for yourself
+---
+
+# Code Push Quickstart
+
+This guide shows you the fastest way to install Shorebird and try code push.
+
+This document is a (slightly) condensed version of our [code push](../code-push/) docs, all on one page.
+
+## Sign up
+
+Before you can create a Shorebird app, you will need to sign up for Shorebird.
+
+### Create an account
+
+To register as a Shorebird user, run:
+
+```sh
+shorebird account create
+```
+
+This will generate a Google sign in link. Follow the link and sign in with your
+Google account.
+
+### Subscribe
+
+Code push is currently only available to paid subscribers. To subscribe, run:
+
+```sh
+shorebird account subscribe
+```
+
+This will generate a payment Stripe payment link. Follow the link and enter your
+payment information.
+
+Subscriptions are $20/month. You can cancel at any time.
+
+## Create the app
+
+Once you have registered and subscribed, you're ready to use Shorebird!
+
+Start by creating a new Flutter app:
+
+```sh
+flutter create my_shorebird_app
+```
+
+As with any Flutter app, you can verify this created the standard Counter app by
+following the instructions printed by `flutter create`:
+
+```sh
+cd my_shorebird_app
+flutter run
+```
+
+### Initialize Shorebird
+
+To make this a Shorebird app, run:
+
+```sh
+shorebird init
+```
+
+This will create a `shorebird.yaml` file in the root of your project. This file
+contains your Shorebird `app_id`.
+
+Run `shorebird doctor` to ensure everything is set up correctly:
+
+```sh
+shorebird doctor
+```
+
+You will notice that this prints an error:
+
+```sh
+[✗] android/app/src/main/AndroidManifest.xml is missing the INTERNET permission.
+```
+
+This is because Shorebird requires the internet permission to download patches.
+You can fix this issue by running:
+
+```sh
+shorebird doctor --fix
+```
+
+### Run the app with Shorebird
+
+To run the app with Shorebird (that is, with [Shorebird's fork of the Flutter
+engine](/faq#how-does-shorebird-relate-to-flutter)), run:
+
+```sh
+shorebird run
+```
+
+Now kill the app on your device or emulator.
+
+### Create a release
+
+We will create a release using the unmodified Counter app. Run:
+
+```sh
+shorebird release
+```
+
+When prompted, use the suggested version number (`1.0.0+1`), and enter `y` when
+asked if you would like to continue.
+
+### Create a patch
+
+We will now make a small change to the Counter app. In `lib/main.dart`, change
+the app theme's `primarySwatch` from blue to green:
+
+```diff
+class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
+  // This widget is the root of your application.
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Flutter Demo',
+      theme: ThemeData(
+        // This is the theme of your application.
+        //
+        // Try running your application with "flutter run". You'll see the
+        // application has a blue toolbar. Then, without quitting the app, try
+        // changing the primarySwatch below to Colors.green and then invoke
+        // "hot reload" (press "r" in the console where you ran "flutter run",
+        // or simply save your changes to "hot reload" in a Flutter IDE).
+        // Notice that the counter didn't reset back to zero; the application
+        // is not restarted.
+-       primarySwatch: Colors.blue,
++       primarySwatch: Colors.green,
+      ),
+      home: const MyHomePage(title: 'Flutter Demo Home Page'),
+    );
+  }
+}
+```
+
+After making this change, save the file and run:
+
+```sh
+shorebird patch
+```
+
+When prompted, use the suggested release version (`1.0.0+1`), and enter `y` when
+asked if you'd like to continue.
+
+### See the patch in action
+
+Launch the app from your device or emulator. The app will still have the
+original blue theme, but it will be downloading the patch we just created in the
+background. Kill and launch the app again, and the app will be green! 🎉

docs/status.md

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 ---
-sidebar_position: 3
+sidebar_position: 4
 title: 👷 Status
 description: Status of the Shorebird project.
 ---

docs/uninstall.md

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-sidebar_position: 6
+sidebar_position: 7
 title: 🛑 Uninstall
 description: How to disable Shorebird.
 ---