patch package.json to support ESM workflows

[thescientist13]

Doing my best guess here to get this package working with ESM

1. Main issue was the entry point, which is an empty file, so needed to override. The current file I have now seems to work without the need of the below point
2. As part of testing, saw cases where dist/ code referenced a bare module of @stencil/core which is only treated as a devDependency by web-social-share and led to missing dependencies in my local project. So if that is actual intentional or not, if generated Stencil files do reference @stencil/* they will need to captured as peerDependencies
3. In my project, it was necessary to use a Rollup plugin to handle building dynamic imports that use variables in them