Use `head.js` to configure the <head> tag of a route segment.
You can fetch data inside `head.js` to create dynamic titles and meta tags.
Next will dedupe requests for the same data across `layout.js`, `page.js` and `head.js` when rendering a route.
Next will wait for any data fetching inside `head.js` to complete before streaming any UI to the client. This guarantuees the first part of a streamed response includes head tags.