* Use Better Telemetry Directory
So, as it turns out, storing in `node_modules` is a bad idea.

Both npm and Yarn will remove additional files when you run `npm install` or `yarn install`.

Instead, we'll store this inside of Next.js' `distDir`. This should also be cached by users, if it's not, it probably won't be any worse as compared to `node_modules`.

* Fix directory name

* Fix build setup

* Record when export session is started

* Move more into branch

* Monkey patch `next-sass` and `next-less`
These two Next.js plugins use poor webpack practices: they define plugins without resolving themselves.

As a result, the resolution root is unknown by webpack and you get into package hoisting bugs.

To fix this, we emulate the logic these packages should've performed themselves on a best-effort basis.

* Add comments explaining the monkey patch

* Fix comment

* Update packages/next/build/webpack-config.ts
Co-Authored-By: NTim Neutkens <tim@timneutkens.nl>

* Show content as soon as <style> tags are added

* Add fallback removal

* Add test for when unused

* Ensure the function is ES5 compatible

* IE support

* Test it works on broken pages

* Remove `config` export
This removes the `config` export instead of all exports.

Reverts #8889 (but with fixed behavior)

* Add test to ensure config object is dropped from client-bundle

These Recipies are not regularly audited to ensure they're using the most up-to-date and suggested practices.

We'll reintroduce the idea of "recipies" in the future, for now, the examples directory is a great place to start.

* s/Automatic Prerendering/Automatic Static Optimization/

* Update more links

* Add new `srcRoute` attribute to SprRoute

* Update prerender manfiest test snapshot

* Fix types

* Add auth0 example

* Apply suggestions from code review
Co-Authored-By: NJoe Haddad <joe.haddad@zeit.co>

* Remove LICENSE

* Add create next-app section

* Update to latest @auth0/nextjs-auth0

* Update user handling

* Update profile link to use <Link>

* Update .env template to reflect guides

* Simplify example

* Update example to prefer API call (temporary hardcoded url)

* Simplify state and ensure rerenders don’t race

* Clear up import being commented

* Make code style consistent

* Update pages to reflect required auth on the client-side

* Memoize the user on window

* Update now.json instruction

* Remove meta fields

* Update docs with explanation

* Update UI for auth0 example

## Changes

- [x] Remove _app.js usage
- [x] Migrate withRedux HOC to functional component
- [x] Add correct display name
- [x] Remove abstractions/boilerplate from example
- [x] Add useInterval HOC from Dan

* Update Prerender Manifest

* Fix typescript

* Add SPR Dynamic Routes to Manifest
This adds dynamic routes for SPR pages to the prerender manifest so we can configure the Now Builder to handle these routes as SPR routes. Otherwise, they're treated like normal `getInitialProps` pages.

* Fix types

* Configure the Default Revalidate
The default revalidate behavior should be configured by Next.js. Otherwise, the behavior might drift or change in non-semver compliant ways between Next.js and the builder (or other 3rd party setups).

* Add additional comment

Per the HTTP specification, only natural numbers may be used for caching durations. We should enforce this with a really helpful error message.

* Favicon should have low importance

* Update index.js

This checks that the program output actually claims there was a build error.

The Now CDN does not support the `stale-if-error` header and already behaves like that for `stale-while-revalidate`.

Removing this header allows Now CDN to use its default headers instead of sending _only_ `stale-if-error` after stripping `s-maxage` and `stale-while-revalidate`.

The first corrected sentence did not feel very natural.
The second one contained a typo.

* Add support for ZEIT Now CI detection

* Add isNowDev to meta fields

* Add revalidate header and error when invalid
object from getStaticProps

* Make sprCache no-op in dev mode

* Update packages/next/next-server/server/next-server.ts

* Update tests for fixes

* Update getStaticProps error and add test

* Update manifest test

* Add validating revalidate value

* Apply suggestions from code review
Co-Authored-By: NJoe Haddad <joe.haddad@zeit.co>

* Change from error to warning high revalidate value