Add microbundle to output more optimal bundles

[sebnitu]

What changed?

The PR introduces Microbundle into the build flow to output more optimal bundles and for a larger range of entry points such as:

• scripts.js - The CommonJS bundle under the main, perfect for Node.
• scripts.esm.js - The ES module bundle under the module, perfect for consumption in bundlers.
• scripts.umd.js - The universal module definition build under the unpkg field, perfect for CDNs.
• scripts.modern.js- A modern bundle specially designed to work in all modern browsers.

Included in this work is also a refactor of distribution, production ready bundles and uncompressed development options. Uncompressed files are created in the new dev directory while the minified versions of those same files can be found in dist. This replaces the previous .min and non .min files that were before also placed in dist. New bundle output for components share this format (excluding .map files):

/dev/
  scripts.js
  scripts.esm.js
  scripts.umd.js
  scripts.modern.js
  styles.css
/dist/
  scripts.js
  scripts.esm.js
  scripts.umd.js
  scripts.modern.js
  styles.css

Release checklist

• Switch docs to Microbundle and only output iife bundle.
• Remove now unused package dependencies (if any).
• Update documentation with details on new bundles and how to use them as well as CDN information.
• Maybe output dev bundles in .gitignore'ed directory for debugging and testing.
• Remove dist (and dev, if created) directories from github commits and only serve with NPM.