## What?
Removes `experimental.appDir` this was leftover from when I flipped the
switch.
Kept the config file as in the future we might add future flags and
such. It also helps that it has the types comment included so you always
get types.
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---------
Co-authored-by: JJ Kasper <jj@jjsweb.site>
### What?
- Add not found boundary to app router
- Move `head` cache back to app router
### Why?
We want the head to be rendered separately from body, previously to be
able to use `redirect()` and `notFound()` in `generateMetadata` we move
the head cache into layout-router to be wrapped by not found and
redirect boundaries. Since redirect boudary is already moved to
app-router, so we only need to add not found boundary and move head
cache to app router.
Notice: there's a limitation that we can't find the corresponding not
found of page if you throw notFound in generateMetadata, the root layout
+ root/default not found will be used to generate the 404 page
### How?
Closes NEXT-864
Fixes#46738
fix NEXT-888 ([link](https://linear.app/vercel/issue/NEXT-888))
---------
In #47328 we made the root level `/not-found.js` a special entry, to
override the page 404 during builds. However, it's possible that the
user has a valid `/not-found/page.js` route that might conflict with
this special entry. This PR changes the entry to be `/_not-found` so it
will never conflict with existing valid entries.
This PR continues the work of #45867, that treats the root-level `not-found.js` file inside app dir as the global 404 page, if it exists. Previously, it fallbacks to the /404 route inside pages (and the default one if `404.js` isn't specified).
In the implementation, we include `/not-found` in `appPaths` during the build, and treat it as the special `/404` path during pre-rendering. In the renderer, if the `/404` pathname is being handled, we always render the not found boundary.
And finally inside the server, we check if `/not-found` exists before picking up the `/404` component.
A deployed example: https://not-found-shuding1.vercel.app/balasdkjfaklsdf
fix NEXT-463 ([link](https://linear.app/vercel/issue/NEXT-463))
