Use package.exports for better compatibility

[dmitri-gb]

Hey!

I'd like to suggest this change in package.json which should make the package more interoperable.

The exports field is the standard way to specify the "main" module and is universally supported by most runtimes and bundlers. The currently used module field does not work in Node.js and even a simple import {} from 'docx-preview' will fail.

I also removed "type": "module", as it is not correct. The property is meant to specify whether .js files in the package are to be interpreted as ES modules or CommonJS. And right now dist/*.js are all CommonJS modules. If you wanted to keep "type": "module", you'd need to rename those files to .cjs.

Finally, I also added moduleResolution to tsconfig.json so that the jszip import would resolve properly.

With these changes, it will be possible to load docx-preview from both ES and CommonJS modules.