Add types for TypeScript type search.

Set NODE_ENV to production when publishing to ensure smaller packed size.

Use prepublishOnly instead of prepublish.

Make sure to build scripts before publishing to registry.

Add @reach/slider because build encounters errors.

Also add base URI to correct paths.

Export declaration files from TypeScript.

Migrate from GitHub, rewrite common components to TypeScript (main and test files). Also replaced Storybook to Docz.