Build via Github Actions and publish up-to-date preview/production deployment builds to npm

[jo-chemla]

Hi, First-of-all, thanks for this great library of effects! I'd like to try-out some recent realism-effects which are not yet available in the module version published to npm 1.1.2. I see you have deployments set-up for production/preview - which might just be hooks to vercel, and publish up-to-date demo pages after any commit.

Could you also push the updated realism-effects build to npm within the same vercel deployment task? Or set-up a Github Action to do so, eventually on versioned? Would be great to test new featues without building the lib ourselves.