Add option to drop Types

[svobik7]

When user is using this library without TypeScript the pages are still generated with some typings and then js throws an error.

Example can be seen here #33 (comment)

[svobik7]

2.0.1-canary.0 has been released with following config which disables page type generation:

// roots.config.js
{
    useTypings: false,
    // ... other configs
}