Joy-UI supports Next.js (#63144)

As stated
[here](https://mui.com/joy-ui/integrations/next-js-app-router/), Joy UI
supports Next.js integration.

Author: devnyxie

docs/02-app/01-building-your-application/05-styling/03-css-in-js.mdx

@@ -16,6 +16,7 @@ The following libraries are supported in Client Components in the `app` director
 - [`chakra-ui`](https://chakra-ui.com/getting-started/nextjs-app-guide)
 - [`kuma-ui`](https://kuma-ui.com)
 - [`@mui/material`](https://mui.com/material-ui/guides/next-js-app-router/)
+- [`@mui/joy`](https://mui.com/joy-ui/integrations/next-js-app-router/)
 - [`pandacss`](https://panda-css.com)
 - [`styled-jsx`](#styled-jsx)
 - [`styled-components`](#styled-components)