Content design page updates (#13143)

<!--
  ☝️How to write a good PR title:
- Prefix it with [ComponentName] (if applicable), for example: [Button]
  - Start with a verb, for example: Add, Delete, Improve, Fix…
  - Give as much context as necessary and as little as possible
  - Open it as a draft if it’s a work in progress
-->
This PR is a follow up to #13012
to make small content changes to the polaris.shopify.com and add a few
redirects.

### WHY are these changes introduced?
- Small editorial udates to a few pages
- Updated page and section titles
- Added missing redirect to account for deleted page. 


### WHAT is this pull request doing?

- Content changes 
- Update to redirects

### How to 🎩

🖥 [Local development
instructions](https://github.com/Shopify/polaris/blob/main/README.md#install-dependencies-and-build-workspaces)
🗒 [General tophatting
guidelines](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting.md)
📄 [Changelog
guidelines](https://github.com/Shopify/polaris/blob/main/.github/CONTRIBUTING.md#changelog)

### 🎩 checklist

- [x] Tested on
[mobile](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting.md#cross-browser-testing)
- [x] Tested on [multiple
browsers](https://help.shopify.com/en/manual/shopify-admin/supported-browsers)
- [x] [Tophatted
documentation](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting%20documentation.md)
changes in the style guide

.changeset/gentle-cycles-teach.md

@@ -0,0 +1,2 @@
+---
+---

polaris.shopify.com/content/content/alternative-text.mdx

@@ -1,6 +1,6 @@
 ---
 title: Alternative text
-description: Alt text provides an inclusive experience for merchants who use screen readers.
+description: Build inclusive experiences for merchants who use screen readers
 icon: ImageAltIcon
 order: 5
 keywords:

polaris.shopify.com/content/content/error-messages.mdx

@@ -26,7 +26,7 @@ Error messages should:
 - Help merchants avoid mistakes in the first place, using clear content to manage expectations and highlight potential risks
 - Only explain what happened behind the scenes when it’s helpful to merchants or you can’t offer a solution
 
-As always, follow all our content principles of keeping it short, using plain language, and getting rid of repetition. Also, good design can reduce the need for error messages by preventing them.
+As always, follow our content [fundamentals](/content/fundamentals) of keeping it short, using plain language, and getting rid of repetition.
 
 ## Design for clarity
 
@@ -114,13 +114,13 @@ Button: Shopify Home
 #### Do
 
 Heading: Couldn’t deposit payout \
-Body: The bank account we have on file was closed. Update your details, and we’ll retry automatically.
+Body: The bank account we have on file was closed. Update your details, and we’ll retry automatically. \
 Button: Update bank account
 
 #### Don’t
 
-Heading: Invalid bank account
-Body: Your payout was not deposited because your bank account was closed. Go to your bank account details and update them to match a valid checking account. Then save so that we can retry.
+Heading: Invalid bank account \
+Body: Your payout was not deposited because your bank account was closed. Go to your bank account details and update them to match a valid checking account. Then save so that we can retry. \
 Button: Next
 
 

polaris.shopify.com/content/content/fundamentals.mdx

@@ -1,6 +1,6 @@
 ---
 title: Fundamentals
-description: How to design content to create world-class software
+description: Designing content for experiences
 icon: TextInColumnsIcon
 order: 1
 keywords:
@@ -36,7 +36,7 @@ keywords:
 
 These fundamentals apply to every piece of content you create. For specific questions, dig into our detailed content guidelines for everything from [grammar](/content/grammar-and-mechanics) to [components](/components).
 
-Think of tools you use every day, such as your phone, car, blender. They all have a learning curve. But the very best of them feel easy from the very first use. Buttons are where you expect them. Labeling is intuitive. Everything unnecessary has been removed, and what’s left is the perfect balance of words and visuals. That’s what we’re building here at Shopify.
+Think of tools you use every day, such as your phone, car, or blender. They all have a learning curve, but the very best of them feel easy from the very first use. Buttons are where you expect them. Labeling is intuitive. Everything unnecessary has been removed, and what’s left is the perfect balance of words and visuals. That’s what we’re building here at Shopify.
 
 
 ## Content 🤝 design

polaris.shopify.com/content/content/inclusive-language.mdx

@@ -1,6 +1,6 @@
 ---
 title: Inclusive language
-description: Make commerce better for everyone by writing inclusively.
+description: Make commerce better for everyone by writing inclusively
 icon: EyeCheckMarkIcon
 order: 6
 keywords:

polaris.shopify.com/content/content/index.mdx

@@ -1,7 +1,7 @@
 ---
 title: Content
 order: 4
-description: Thoughtful, crafted content is a core element of a well-designed user experience
+description: How to use content to build a world-class user experience
 icon: TextAlignmentLeftIcon
 ---
 

polaris.shopify.com/content/content/naming.mdx

@@ -1,6 +1,6 @@
 ---
 title: Naming
-description: What to consider as you name products and features
+description: What to consider as you name products or features
 icon: ProductIcon
 order: 4
 keywords:

polaris.shopify.com/content/getting-started/index.mdx

@@ -41,7 +41,7 @@ The [Shopify/polaris GitHub repo](https://github.com/Shopify/polaris) is an open
 
 ## Tutorials
 
-### [Build a Shopify app](https://shopify.dev/apps/getting-started/create)
+#### [Build a Shopify app](https://shopify.dev/apps/getting-started/create)
 
 In this tutorial, you'll create an app that merchants can access in the Shopify admin. You'll use an app initialization command that generates starter code for building your app, and sets up your development environment so that you can work with your app using [Shopify CLI](https://shopify.dev/apps/tools/cli).
 
@@ -51,6 +51,6 @@ Your app will use Polaris and [App Bridge](https://shopify.dev/apps/tools/app-br
 
 Polaris provides foundational design guidance for creating good merchant experiences. Here are some recommended resources to:
 
-- [Experience Values](/foundations/experience-values)
+- [Experience values](/foundations/experience-values)
 - [Design guidelines](/design)
-- [Product content](/content/product-content)
+- [Content fundamentals](/content/fundamentals)

polaris.shopify.com/content/patterns/common-actions/variants/best-practices.mdx

@@ -18,7 +18,7 @@ keywords:
 
     Actions should always clearly communicate their purpose by using a text label, an icon, or a combination of both.
 
-    See the [actionable language guidelines](/content/actionable-language#buttons) for more detail.
+    See [fundamentals](/content/fundamentals#inspire-action) for more detail.
 
     </Stack>
 

polaris.shopify.com/next.config.js

@@ -169,6 +169,16 @@ const nextConfig = {
         destination: '/content/fundamentals',
         permanent: true,
       },
+      {
+        source: '/content/voice-and-tone',
+        destination: '/content/fundamentals',
+        permanent: true,
+      },
+      {
+        source: '/content/merchant-to-customer',
+        destination: '/content/fundamentals',
+        permanent: true,
+      },
       ...whatsNew,
       ...actions,
       ...deprecated,