Fix hard-verified broken links and redirect destinations (#4339)

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: Swimburger

fern/docs.yml

@@ -211,7 +211,7 @@ redirects:
   - source: /learn/sdks/guides/publish-to-package-managers/pypi
     destination: /learn/sdks/generators/python/publishing
   - source: /learn/sdks/guides/publish-to-package-managers/nuget
-    destination: /learn/sdks/generators/net/publishing
+    destination: /learn/sdks/generators/csharp/publishing
   - source: /learn/sdks/guides/publish-to-package-managers/pkgsite
     destination: /learn/sdks/generators/go/publishing
   - source: /learn/sdks/guides/publish-to-package-managers/maven-central
@@ -237,7 +237,7 @@ redirects:
   - source: /learn/sdks/overview/github
     destination: /learn/sdks/overview/project-structure
   - source: /learn/sdks/introduction/customer-showcase
-    destination: /learn/sdks/customer-showcase
+    destination: /learn/sdks/overview/introduction
   - source: /learn/sdks/introduction/changelog/ts/:slug*
     destination: /learn/sdks/generators/typescript/changelog/:slug*
   - source: /learn/sdks/introduction/changelog/python/:slug*
@@ -372,7 +372,7 @@ redirects:
   - source: /learn/docs/customization/custom-header-and-footer
     destination: /learn/docs/customization/header-and-footer
   - source: /learn/docs/content/frontmatter
-    destination: /learn/docs/customization/frontmatter
+    destination: /learn/docs/configuration/page-level-settings
   - source: /learn/docs/content/reusable-snippets
     destination: /learn/docs/writing-content/reusable-snippets
   - source: /learn/docs/writing-content/reusable-markdown
@@ -492,11 +492,11 @@ redirects:
     destination: /learn/cli-api-reference/cli-reference/options
   # CLI patterns
   - source: /learn/cli-api/cli-reference/:slug*
-    destination: /learn/cli-reference/:slug*
+    destination: /learn/cli-api-reference/cli-reference/:slug*
   - source: /learn/cli-api/cli/:slug*
-    destination: /learn/cli-reference/:slug*
+    destination: /learn/cli-api-reference/cli-reference/:slug*
   - source: /learn/cli-api/:slug*
-    destination: /learn/cli-reference/:slug*
+    destination: /learn/cli-api-reference/cli-reference/:slug*
   - source: /learn/cli-reference/changelog/:slug*
     destination: /learn/cli-api-reference/cli-reference/changelog/:slug*
 
@@ -526,7 +526,7 @@ redirects:
   - source: /learn/api-definition/openapi/audiences
     destination: /learn/api-definitions/openapi/extensions/audiences
   - source: /learn/api-definition/openapi/examples
-    destination: /learn/api-definitions/openapi/extensions/examples
+    destination: /learn/api-definitions/openapi/extensions/request-response-examples
   - source: /learn/api-definition/openapi/:slug*
     destination: /learn/api-definitions/openapi/:slug*
   - source: /learn/openapi-definition/extensions/webhooks
@@ -756,7 +756,7 @@ redirects:
   - source: /learn/api-definitions/openrpc/extensions/sdk-group-name
     destination: /learn/api-definitions/openrpc/extensions/sdk-group-names
   - source: /learn/api-definitions/openrpc/extensions/examples
-    destination: /learn/api-definitions/openrpc/examples
+    destination: /learn/api-definitions/openrpc/extensions/request-response-examples
   - source: /learn/api-definitions/openrpc/extensions/retry
     destination: /learn/api-definitions/openrpc/extensions/overview
   - source: /learn/overview/define-your-api/openapi/extensions

fern/products/docs/pages/component-library/writing-content/markdown-basics.mdx

@@ -15,7 +15,7 @@ Throughout this documentation, "Markdown" refers to both Markdown and MDX. [MDX]
 
 Add pages manually to your documentation by creating Markdown (`.md`) or MDX (`.mdx`) files. New to Markdown? See [Markdown Guide: Getting started](https://www.markdownguide.org/getting-started/).
 
-Place your pages inside your `fern/` folder and link to them from your [navigation settings](/learn/docs/building-your-docs/navigation) in the `docs.yml` file.
+Place your pages inside your `fern/` folder and link to them from your [navigation settings](/learn/docs/configuration/navigation) in the `docs.yml` file.
 
 In the example below, the MDX files are inside a folder named `pages/`.
 
@@ -60,7 +60,7 @@ Use a `/` character to begin a relative URL to another page on your docs site. T
 
 <CodeBlock title='Relative link example'>
 ```mdx
-Read the [Introduction](/learn/overview/introduction).
+Read the [Introduction](/learn/sdks/overview/introduction).
 ```
 </CodeBlock>
 

fern/products/docs/pages/navigation/announcement-banner.mdx

@@ -9,7 +9,7 @@ An announcement banner is a great way to draw attention to new features and prod
 
 ```yaml docs.yml
 announcement:
-    message: "🚀 New feature: Announcements are available! (<a href=\"https://buildwithfern.com/learn/docs/building-your-docs/announcements\" target=\"_blank\">Learn more</a>) 🚀"
+    message: "🚀 New feature: Announcements are available! (<a href=\"https://buildwithfern.com/learn/docs/customization/announcement-banner\" target=\"_blank\">Learn more</a>) 🚀"
 ```
 
 Markdown and HTML is supported in the announcement message. You can include links, images, and other formatting. [Custom CSS](/docs/customization/custom-css-js#custom-css) can be used to customize the style of the announcement.

fern/products/docs/pages/resources/stainless-comparison.mdx

@@ -100,7 +100,7 @@ Stainless [deploys static files](https://www.stainless.com/docs/docs-platform/ho
 
 | Feature | Fern Docs | Stainless Docs |
 |---------|-----------|----------------|
-| **Cloud hosting** | ✅ [Vercel with AWS VPC backend](/learn/docs/getting-started/publishing-your-docs) | ✅ Cloudflare (default) |
+| **Cloud hosting** | ✅ [Vercel with AWS VPC backend](/learn/docs/preview-publish/publishing-your-docs) | ✅ Cloudflare (default) |
 | **Self-hosted** | ✅ [Full-stack Docker](/learn/docs/self-hosted/overview) (PostgreSQL, S3/MinIO, MeiliSearch) | ❌ Static files only |
 | **Custom domains** | ✅ [Full support](/learn/docs/preview-publish/setting-up-your-domain) | ✅ Full support |
 <br/>
@@ -113,8 +113,8 @@ Stainless doesn't currently document redirect capabilities. Fern's [redirect sys
 | Feature | Fern Docs | Stainless Docs |
 |---------|-----------|----------------|
 | **Redirects** | ✅ [299+ rules](/learn/docs/seo/redirects) with pattern matching (`:slug`, `:splat`) | ❌ None |
-| **SEO optimization** | ✅ [Meta tags, JSON-LD, RSS, OG images, Twitter cards](/learn/docs/seo/metadata) | ✅ Basic meta tags |
-| **Sitemap & robots.txt** | ✅ [Automatic generation](/learn/docs/seo/metadata) | ✅ Automatic (assumed) |
+| **SEO optimization** | ✅ [Meta tags, JSON-LD, RSS, OG images, Twitter cards](/learn/docs/seo/setting-seo-metadata) | ✅ Basic meta tags |
+| **Sitemap & robots.txt** | ✅ [Automatic generation](/learn/docs/seo/setting-seo-metadata) | ✅ Automatic (assumed) |
 <br/>
 </Accordion>