Add note about Old and New Architectures to relevant docs (#1029)

## Description

This PR adds a notice to the top of every relevant page that is either
clearly:

1. *Old Architecture Only*: doc is for Old Architecture features not
planned/supported in the New Arch
2. *Architecture Review Needed*: doc may or may not apply to in the new
architecture and therefore needs further review.

I've also added the appropriate tag on every page:


![Architecture](https://img.shields.io/badge/architecture-new_&_old-green)

![Architecture](https://img.shields.io/badge/architecture-new_only-blue)


![Architecture](https://img.shields.io/badge/architecture-old_only-yellow)


![Architecture](https://img.shields.io/badge/architecture-needs_review-red)

### Why
Lots of things change with the migration to the New Architecture, and we
want to give some warning about docs that may be out of date while we
sort out which to update, which to deprecate, etc.

Resolves #1014 

## Screenshots
N/A

###### Microsoft Reviewers: [Open in
CodeFlow](https://microsoft.github.io/open-pr/?codeflow=https://github.com/microsoft/react-native-windows-samples/pull/1029)

Author: jthysell

docs/app-publishing.md

@@ -3,6 +3,10 @@ id: app-publishing
 title: Publishing a React Native Windows App to the Microsoft Store
 ---
 
+![Architecture](https://img.shields.io/badge/architecture-needs_review-red)
+
+> **Architecture Review Needed:** This documentation was written to support development against React Native's "Old" or "Legacy" Architecture. It *may or may not* be directly applicable to New Architecture development and needs to be reviewed and potentially updated. For information on React Native architectures in React Native Windows, see [New vs. Old Architecture](new-architecture.md).
+
 ## Steps to Publish a React Native Windows App to the Microsoft Store
 These are the steps to follow if you are looking to publish a React Native Windows app as a third party to the Microsoft Store. Since React Native Windows apps are Universal Windows Platform (UWP) apps, you can also see [Publish Windows apps - UWP applications | Microsoft Docs](https://docs.microsoft.com/windows/uwp/publish/) for all kinds of documentation on the UWP app publishing process. 
 

docs/autolink-windows-cli.md

@@ -3,6 +3,8 @@ id: autolink-windows-cli
 title: react-native autolink-windows
 ---
 
+![Architecture](https://img.shields.io/badge/architecture-new_&_old-green)
+
 This guide will give you more information on the `autolink-windows` command of the React Native Windows CLI.
 
 ## `autolink-windows`

docs/codegen-windows-cli.md

@@ -3,6 +3,8 @@ id: codegen-windows-cli
 title: react-native codegen-windows
 ---
 
+![Architecture](https://img.shields.io/badge/architecture-new_&_old-green)
+
 This guide will give you more information on the `codegen-windows` command of the React Native Windows CLI.
 
 ## `codegen-windows`

docs/config.md

@@ -3,6 +3,10 @@ id: config
 title: React Native Config Schema
 ---
 
+![Architecture](https://img.shields.io/badge/architecture-needs_review-red)
+
+> **Architecture Review Needed:** This documentation was written to support development against React Native's "Old" or "Legacy" Architecture. It *may or may not* be directly applicable to New Architecture development and needs to be reviewed and potentially updated. For information on React Native architectures in React Native Windows, see [New vs. Old Architecture](new-architecture.md).
+
 The CLI command [`npx react-native config`](https://github.com/react-native-community/cli/blob/master/docs/commands.md#config) outputs project and dependencies configuration in JSON format to `stdout`.
 
 The following describes the schema for projects and dependencies provided by React Native for Windows.

docs/customizing-SDK-versions.md

@@ -3,6 +3,10 @@ id: customizing-sdk-versions
 title: Customizing SDK versions
 ---
 
+![Architecture](https://img.shields.io/badge/architecture-needs_review-red)
+
+> **Architecture Review Needed:** This documentation was written to support development against React Native's "Old" or "Legacy" Architecture. It *may or may not* be directly applicable to New Architecture development and needs to be reviewed and potentially updated. For information on React Native architectures in React Native Windows, see [New vs. Old Architecture](new-architecture.md).
+
 It is easy for an app to customize which versions of the Windows SDK and WinUI 2.x to use.
 
 ### Details

docs/debugging-javascript.md

@@ -3,6 +3,10 @@ id: debugging-javascript
 title: JavaScript Debugging
 ---
 
+![Architecture](https://img.shields.io/badge/architecture-needs_review-red)
+
+> **Architecture Review Needed:** This documentation was written to support development against React Native's "Old" or "Legacy" Architecture. It *may or may not* be directly applicable to New Architecture development and needs to be reviewed and potentially updated. For information on React Native architectures in React Native Windows, see [New vs. Old Architecture](new-architecture.md).
+
 This page details how to debug the JavaScript code in your RNW applications, including which tools are supported in which scenarios. You have two different options: *Direct Debugging* and *Web Debugging*.
 
 > Unless stated otherwise, each of the debugging scenarios detailed below assume you're loading your JS bundle from the Metro Packager, not loading a prebuilt bundle file.

docs/flyout-component-windows.md

@@ -3,6 +3,10 @@ id: flyout-component
 title: Flyout
 ---
 
+![Architecture](https://img.shields.io/badge/architecture-old_only-yellow)
+
+> **Old Architecture Only:** This documentation describes a feature only supported by React Native's "Old" or "Legacy" Architecture. We are still in the progress of updating all of the documentation, but in the meantime, for information on React Native architectures in React Native Windows, see [New vs. Old Architecture](new-architecture.md).
+
 # Reference
 
 ## Props

docs/getting-started.md

@@ -3,6 +3,8 @@ id: getting-started
 title: Get Started with Windows
 ---
 
+![Architecture](https://img.shields.io/badge/architecture-new_&_old-green)
+
 This guide will help you get started on setting up your very first React Native for Windows app.
 
 Make sure you have installed all of the [development dependencies](rnw-dependencies.md).

docs/glyph-component-windows.md

@@ -3,6 +3,10 @@ id: glyph-component
 title: Glyph
 ---
 
+![Architecture](https://img.shields.io/badge/architecture-old_only-yellow)
+
+> **Old Architecture Only:** This documentation describes a feature only supported by React Native's "Old" or "Legacy" Architecture. We are still in the progress of updating all of the documentation, but in the meantime, for information on React Native architectures in React Native Windows, see [New vs. Old Architecture](new-architecture.md).
+
 # Reference
 
 ## Props

docs/hermes.md

@@ -3,6 +3,8 @@ id: hermes
 title: Hermes on Windows + macOS
 ---
 
+![Architecture](https://img.shields.io/badge/architecture-new_&_old-green)
+
 # Hermes
 
 The [Hermes](https://hermesengine.dev/) engine is an open source JavaScript engine created by Facebook to optimize building and running React Native applications.