* Created a new example for React Native web
- use the latest `react-native-web`
- remove unused `react-art`
- remove redundant `babel-plugin-module-resolver`
- remove unused `.babelrc`
- add missing `app.json` (standard in React Native)
- added example for rendering an `<a />`
- added header examples
* `yarn lint-fix`
I wrote a [script](https://github.com/j0lv3r4/dependency-version-updater) to update dependencies recursively in `package.json` files, e.g.:
```
$ node index.js --path="./examples" --dependencies="react=^16.7.0,react-dom=^16.7.0"
```
This PR contains the result against the examples folder.