[docs] Fix SEO issue broken links

#38396

CHANGELOG.md

@@ -582,7 +582,7 @@ A big thanks to the 15 contributors who made this release possible. Here are som
 - 💫 Material UI, Joy UI, and Base UI are compatible with [NextJS App Router](https://nextjs.org/docs/app) (#37656) @mj12albert
 - 📚 Added new guides for integrating with Next.js 13 App Router (#37656) @mj12albert
   - Ⓜ️ [Material UI guide](https://mui.com/material-ui/guides/next-js-app-router/)
-  - 🅙 [Joy UI guide](https://mui.com/joy-ui/guides/next-js-app-router/)
+  - 🅙 [Joy UI guide](https://mui.com/joy-ui/integrations/next-js-app-router/)
   - 🅱️ [Base UI guide](https://mui.com/base-ui/guides/next-js-app-router/)
 - 🐛 bug fixes, 📚 documentation, and ⚙️ infrastructure improvements.
 

docs/data/joy/getting-started/tutorial/tutorial.md

@@ -256,4 +256,4 @@ Learn more about [different customization approaches](/joy-ui/customization/appr
 To see some more sophisticated examples of Joy UI in action, check out our [collection of templates](/joy-ui/getting-started/templates/).
 
 Are you migrating from Material UI?
-Learn how to work with [Joy UI and Material UI together in one app](/joy-ui/integrations/material-ui//).
+Learn how to work with [Joy UI and Material UI together in one app](/joy-ui/integrations/material-ui/).

docs/pages/blog/mui-next-js-app-router.md

@@ -26,8 +26,8 @@ See [this explanation of Client Components and SSR](https://github.com/reactwg/s
 Additionally, we've created guides to walk you through setting up an app using the Next.js App Router with each of the Core libraries:
 
 - [Material UI setup](https://mui.com/material-ui/guides/next-js-app-router/)
+- [Joy UI setup](https://mui.com/joy-ui/integrations/next-js-app-router/)
 - [Base UI setup](https://mui.com/base-ui/guides/next-js-app-router/)
-- [Joy UI setup](https://mui.com/joy-ui/guides/next-js-app-router/)
 
 <img alt="Screenshot of the Material UI documentation" src="/static/blog/mui-next-js-app-router/docs.png" loading="lazy" width="2400" height="1394" style="margin-bottom:24px;" />
 

docs/public/_redirects

@@ -488,6 +488,9 @@ https://v4.material-ui.com/* https://v4.mui.com/:splat 301!
 /base-ui/react-components/ /base-ui/all-components/ 301
 /system/getting-started/overview/ /system/getting-started/ 301
 /blog/introducing-mui-base/ /blog/introducing-base-ui/ 301
+/joy-ui/guides/next-js-app-router/ /joy-ui/integrations/next-js-app-router/ 301
+/joy-ui/guides/using-joy-ui-and-material-ui-together/ /joy-ui/integrations/material-ui/ 301
+/joy-ui/guides/using-icon-libraries/ /joy-ui/integrations/icon-libraries/ 301
 
 # Proxies