@rehookify/datepicker 6.2.1

DevEx improments

on Node.js NPM

In order to simplify setup and CONTRIBUTION to the library we moved to the pnpm with workspace.
It gives us such benefits:

• single install, now you need to run pnpm i in the root folder
• workspace package linking, examples app will get the latest version of the datepicker automatically
• consistent e2e, because of the previous point we can test over the latest lib version in CI
• the simplicity of running the app for development pnpm dev in the root folder will run dev server and build lib in watch mode

All changes was reflected in the CONTRIBUTING.md