Update Next.js error handling documentation and add new examples

- Refactor error handling examples for App Router and Pages Router to include Next.js-specific paths.
- Introduce new documentation for custom global error components and error handling in nested React Server Components.
- Remove outdated Hono and NestJS error handling documentation.
- Add new files for capturing errors in Next.js App Router and Pages Router.

This update enhances clarity and organization in the error handling section of the Next.js documentation.

Author: codyde

docs/platforms/javascript/guides/nextjs/index.mdx

@@ -148,15 +148,15 @@ Make sure runtime errors are surfaced to Sentry using Next.js error components.
 
 ### App Router
 
-<PlatformContent includePath="getting-started-capture-errors/app-router-global-error" />
+<PlatformContent includePath="getting-started-capture-errors/nextjs/app-router-global-error" />
 
 #### Errors from Nested React Server Components
 
-<PlatformContent includePath="getting-started-capture-errors/nested-server-components" />
+<PlatformContent includePath="getting-started-capture-errors/nextjs/nested-server-components" />
 
 ### Pages Router
 
-<PlatformContent includePath="getting-started-capture-errors/pages-router-error" />
+<PlatformContent includePath="getting-started-capture-errors/nextjs/pages-router-error" />
 
 <Alert level="info">
   The installation wizard will scaffold these files for you if they are missing.

docs/platforms/javascript/guides/nextjs/manual-setup.mdx

@@ -263,15 +263,15 @@ To capture React render errors, you need to add error components for the App Rou
 
 ### App Router
 
-<PlatformContent includePath="getting-started-capture-errors/app-router-global-error" />
+<PlatformContent includePath="getting-started-capture-errors/nextjs/app-router-global-error" />
 
 #### Errors from Nested React Server Components
 
-<PlatformContent includePath="getting-started-capture-errors/nested-server-components" />
+<PlatformContent includePath="getting-started-capture-errors/nextjs/nested-server-components" />
 
 ### Pages Router
 
-<PlatformContent includePath="getting-started-capture-errors/pages-router-error" />
+<PlatformContent includePath="getting-started-capture-errors/nextjs/pages-router-error" />
 
 ## Step 4: Add Readable Stack Traces With Source Maps (Optional)