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
```
It's a change to the package.json file to update the supertokens-auth-react version. The changes in this version are:
- How supertokens session works in the context of an iframe
- Dependencies of supertokens-auth-react now use a `^`
--------
One more change is to do with how the redirection works in the demo app in case of session expiry or if a user clicks on signout.
- Since SuperTokens is a self hosted solution, it can be added to 'Bring Your Own Database' as well (in https://nextjs.org/docs/authentication#supertokens)
- Improvements to code structure in the with-supertokens example
