docs: update broken links theme configuration page (#8976)

Co-authored-by: Sébastien Lorber <slorber@users.noreply.github.com>

website/docs/api/themes/theme-configuration.mdx

@@ -794,7 +794,7 @@ const defaultMagicComments = [
 
 ### Theme {#theme}
 
-By default, we use [Palenight](https://github.com/FormidableLabs/prism-react-renderer/blob/master/src/themes/palenight.js) as syntax highlighting theme. You can specify a custom theme from the [list of available themes](https://github.com/FormidableLabs/prism-react-renderer/tree/master/src/themes). You may also use a different syntax highlighting theme when the site is in dark mode.
+By default, we use [Palenight](https://github.com/FormidableLabs/prism-react-renderer/blob/master/packages/prism-react-renderer/src/themes/palenight.ts) as syntax highlighting theme. You can specify a custom theme from the [list of available themes](https://github.com/FormidableLabs/prism-react-renderer/tree/master/packages/prism-react-renderer/src/themes). You may also use a different syntax highlighting theme when the site is in dark mode.
 
 Example configuration: