* Added support for easy development configuration in bootstrap.js
* Added extra variables for existing configuration in broadcasting
* Update bootstrap.js
* Setting default for empty variable
* Update .env.example
* Update .env.example
Co-authored-by: Taylor Otwell <taylor@laravel.com>
This is unnessecery code because Axios already automatically adds
a X-XSRF-TOKEN header from the XSRF-TOKEN cookie encrypted value on
same-origin requests. The `VerifyCsrfToken` middleware and Passport's
`TokenGuard` already allow using the `X-XSRF-TOKEN` header.