Depends on https://github.com/vercel/turbo/pull/5398 (and downstack) on
the Turbo side.
This PR makes it so the output path of Node.js entry chunks for pages is
determined solely from the pathname. This isn't actually necessary for
pages, but it makes for easier debugging anyway. See the Turbo PR for
more details.
This also changes the page structure so it also works if there is no
`pages` directory. In this case, we still want to use pages' default
_app, _document, and _error pages, even with existing app routes. So an
empty page structure should still have an effect.
## Turbopack updates
* https://github.com/vercel/turbo/pull/5415 <!-- Will Binns-Smith -
Turbopack: Execution tests in node.js -->
* https://github.com/vercel/turbo/pull/5461 <!-- Tobias Koppers - use a
lock to ensure atomic invalidation from file changes -->
* https://github.com/vercel/turbo/pull/5398 <!-- Alex Kirszenberg -
Configure the path of the Node.js entry chunk -->
* https://github.com/vercel/turbo/pull/5469 <!-- Tobias Koppers - allow
hmr tests to correctly detect hmr event -->
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