Clean up package.json files in the `examples` directory:
- Add `private: true`
- Remove `version` (because they are irrelevant for packages that are not meant to be published)
- Remove `name` (because they are optional for packages that are not meant to be published, and when someone clones an example, they often rename it and the property becomes stale)
- Remove `author`
- Remove `description`
- Remove `license`
Also remove `with-dynamic-app-layout` example completely, since it does the same as `layout-component` (https://github.com/vercel/next.js/pull/27121#discussion_r668178408).
## Documentation / Examples
- [x] Make sure the linting passes
[With next 11 requiring react 17](https://nextjs.org/blog/next-11#upgrade-guide), most of the examples
need to be updated, so the following snippet updated all the examples to
a compatible react version.
```bash
cd examples/
fd -g 'package.json' | xargs sed -r -i 's/"react": ".*"/"react": "^17.0.2"/
fd -g 'package.json' | xargs sed -r -i 's/"react-dom": ".*"/"react-dom": "^17.0.2"/'
# exclude experimental react version
git checkout with-reason-relay/package.json
```
* yarn create next-app
* create an upload show page
* create upload page to handle in-progress upload and asset when it is ready
* move things to a layout component
* add some button styling
* poll for updates intelligently by dynamically setting refreshInterval on SWR hook
* better title
* edit gitignore, add MIT license use next 'latest'
based on feedback from https://github.com/zeit/next.js/pull/12723
* add some messages and spinner to make this a little nicer
* update README with environment variables info and Mux account info
* add .now to gitignore
* cleaner uploading state - redirect to /v/:playback_id when complete
* hardset image width in footer
* remove unused styles
* adjust title font size on mobile and adjust footer height on mobile
* use upchunk 1.0.8 so we don't have to dynamically load it
* cleaner error message handling
* fix brief error from returning Router on the render
* yarn lint-fix
* update README with note about .env.local
* add min height so the layout doesn't shift after selecting a file
* set poster attribute at video element
* use getStaticProps and fallback:true to render meta tags for social sharing
* create a pages/asset/:id route that we can be on while in the preparing state
* add copy about Mux, add twitter share widget
* add flash message about video ready for playback
* call it pre-rendered instead of server-side rendered
* pre-rendering, not server-side rendering
* Next.js not NextJS
* handle asset creation errors in the UI
* call hls.destroy() when the component is unmounted
* Updated readme and renamed .env.local
* Updated description
* add suggested patch with links to source code https://github.com/zeit/next.js/pull/13120#issuecomment-632858572
* Added vercel.json
* Updated some links
* Removed Prerequisites
Co-authored-by: Luis Alvarez <luis@vercel.com>
